diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4116684..2d83bc3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,6 +6,7 @@ executors:
       - image: circleci/node:10-stretch-browsers
     environment:
       - FIREFOX_VERSION: "60.0esr"
+      - GECKODRIVER_VERSION: "0.24.0"
     working_directory: ~
 
 commands:
@@ -29,6 +30,18 @@ commands:
             - ~/firefox
       - run: echo 'export PATH=~/firefox/$FIREFOX_VERSION:$PATH' >> $BASH_ENV
 
+  install_geckodriver:
+    steps:
+      - run:
+          name: Install geckodriver
+          command: |
+            mkdir -p geckodriver
+
+            url=https://github.com/mozilla/geckodriver/releases/download/v0.24.0/geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz
+            curl -sSLf "$url" | tar  -C geckodriver xvf -
+
+            echo 'export PATH=~/geckodriver/$GECKODRIVER_VERSION:$PATH' >> $BASH_ENV
+
   setup_npm:
     steps:
       - restore_cache:
@@ -61,10 +74,9 @@ jobs:
       - checkout
       - setup_npm
       - run: npm run build
-      - run: npm run ambassador:build
       - run:
-          name: Run web server
-          command: node e2e/web-server
+          name: Run geckodriver
+          command: geckodriver
           background: true
       - run: npm run test:e2e
 
diff --git a/.gitignore b/.gitignore
index 07d22c4..10a2021 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /node_modules/
 /build/
-/e2e/ambassador/build/
 *.zip
+lanthan-driver.log
diff --git a/e2e/ambassador/manifest.json b/e2e/ambassador/manifest.json
deleted file mode 100644
index d2253f6..0000000
--- a/e2e/ambassador/manifest.json
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-  "manifest_version": 2,
-  "name": "ambassador",
-  "description": "WebExtension test helper",
-  "version": "0.1",
-  "content_scripts": [
-    {
-      "all_frames": true,
-      "matches": [ "<all_urls>" ],
-      "js": [ "build/content.js" ],
-      "run_at": "document_start",
-      "match_about_blank": true
-    }
-  ],
-  "background": {
-    "scripts": [
-      "build/background.js"
-    ]
-  },
-  "permissions": [
-    "history",
-    "sessions",
-    "storage",
-    "tabs",
-    "clipboardRead",
-    "activeTab"
-  ]
-}
diff --git a/e2e/ambassador/src/background/index.js b/e2e/ambassador/src/background/index.js
deleted file mode 100644
index ce21dc8..0000000
--- a/e2e/ambassador/src/background/index.js
+++ /dev/null
@@ -1,49 +0,0 @@
-import {
-  WINDOWS_CREATE, WINDOWS_REMOVE, WINDOWS_GET,
-  TABS_CREATE, TABS_SELECT_AT, TABS_GET, TABS_UPDATE, TABS_REMOVE,
-  TABS_GET_ZOOM, TABS_SET_ZOOM,
-  EVENT_KEYPRESS, EVENT_KEYDOWN, EVENT_KEYUP,
-  SCROLL_GET, SCROLL_SET,
-} from '../shared/messages';
-import * as tabs from './tabs';
-import { receiveContentMessage } from './ipc';
-
-receiveContentMessage((message) => {
-  switch (message.type) {
-  case WINDOWS_CREATE:
-    return browser.windows.create({ url: message.url });
-  case WINDOWS_REMOVE:
-    return browser.windows.remove(message.windowId);
-  case WINDOWS_GET:
-    return browser.windows.get(message.windowId, { populate: true });
-  case TABS_CREATE:
-    return tabs.create({
-      url: message.url,
-      windowId: message.windowId,
-    });
-  case TABS_SELECT_AT:
-    return tabs.selectAt({
-      windowId: message.windowId,
-      index: message.index,
-    });
-  case TABS_GET:
-    return browser.tabs.get(message.tabId);
-  case TABS_UPDATE:
-    return browser.tabs.update(message.tabId, message.properties);
-  case TABS_REMOVE:
-    return browser.tabs.remove(message.tabId);
-  case TABS_GET_ZOOM:
-    return browser.tabs.getZoom(message.tabId);
-  case TABS_SET_ZOOM:
-    return browser.tabs.setZoom(message.tabId, message.factor);
-  case EVENT_KEYPRESS:
-  case EVENT_KEYDOWN:
-  case EVENT_KEYUP:
-  case SCROLL_GET:
-  case SCROLL_SET:
-    return browser.tabs.sendMessage(
-      message.tabId,
-      message
-    );
-  }
-});
diff --git a/e2e/ambassador/src/background/ipc.js b/e2e/ambassador/src/background/ipc.js
deleted file mode 100644
index 95d2164..0000000
--- a/e2e/ambassador/src/background/ipc.js
+++ /dev/null
@@ -1,7 +0,0 @@
-const receiveContentMessage = (func) => {
-  browser.runtime.onMessage.addListener((message) => {
-    return func(message);
-  });
-};
-
-export { receiveContentMessage };
diff --git a/e2e/ambassador/src/background/tabs.js b/e2e/ambassador/src/background/tabs.js
deleted file mode 100644
index 5594134..0000000
--- a/e2e/ambassador/src/background/tabs.js
+++ /dev/null
@@ -1,28 +0,0 @@
-const create = (props = {}) => {
-  return new Promise((resolve) => {
-    browser.tabs.create(props).then((createdTab) => {
-      let callback = (tabId, changeInfo, tab) => {
-        if (tab.url !== 'about:blank' && tabId === createdTab.id &&
-            changeInfo.status === 'complete') {
-          browser.tabs.onUpdated.removeListener(callback);
-
-          // wait for 50 milliseconds to ensure plugin loaded;
-          setTimeout(() => resolve(tab), 50);
-        }
-      };
-      browser.tabs.onUpdated.addListener(callback);
-    });
-  });
-};
-
-const selectAt = (props = {}) => {
-  return browser.tabs.query({ windowId: props.windowId }).then((tabs) => {
-    let target = tabs[props.index];
-    return browser.tabs.update(target.id, { active: true });
-  });
-};
-
-
-export {
-  create, selectAt
-};
diff --git a/e2e/ambassador/src/client/ipc.js b/e2e/ambassador/src/client/ipc.js
deleted file mode 100644
index 9f232ea..0000000
--- a/e2e/ambassador/src/client/ipc.js
+++ /dev/null
@@ -1,29 +0,0 @@
-import { METHOD_REQUEST, METHOD_RESPONSE } from '../shared/messages';
-
-const generateId = () => {
-  return Math.random().toString();
-};
-
-const send = (message) => {
-  return new Promise((resolve) => {
-    let id = generateId();
-    let callback = (e) => {
-      let packet = e.data;
-      if (e.source !== window || packet.method !== METHOD_RESPONSE ||
-        packet.id !== id) {
-        return;
-      }
-      window.removeEventListener('message', callback);
-      resolve(packet.message);
-    };
-    window.addEventListener('message', callback);
-
-    window.postMessage({
-      id,
-      method: METHOD_REQUEST,
-      message
-    }, window.origin);
-  });
-};
-
-export { send };
diff --git a/e2e/ambassador/src/client/keys.js b/e2e/ambassador/src/client/keys.js
deleted file mode 100644
index 6b36c23..0000000
--- a/e2e/ambassador/src/client/keys.js
+++ /dev/null
@@ -1,28 +0,0 @@
-import { EVENT_KEYPRESS, EVENT_KEYDOWN, EVENT_KEYUP } from '../shared/messages';
-import * as ipc from './ipc';
-
-const NEUTRAL_MODIFIERS = { shiftKey: false, altKey: false, ctrlKey: false };
-
-const press = (tabId, key, modifiers = NEUTRAL_MODIFIERS) => {
-  return ipc.send({ ...modifiers,
-    type: EVENT_KEYPRESS,
-    tabId,
-    key, });
-};
-
-const down = (tabId, key, modifiers = NEUTRAL_MODIFIERS) => {
-  return ipc.send({ modifiers,
-    type: EVENT_KEYDOWN,
-    tabId,
-    key, });
-};
-
-
-const up = (tabId, key, modifiers = NEUTRAL_MODIFIERS) => {
-  return ipc.send({ modifiers,
-    type: EVENT_KEYUP,
-    tabId,
-    key, });
-};
-
-export { press, down, up };
diff --git a/e2e/ambassador/src/client/scrolls.js b/e2e/ambassador/src/client/scrolls.js
deleted file mode 100644
index f8f82e9..0000000
--- a/e2e/ambassador/src/client/scrolls.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { SCROLL_GET, SCROLL_SET } from '../shared/messages';
-import * as ipc from './ipc';
-
-const get = (tabId) => {
-  return ipc.send({
-    type: SCROLL_GET,
-    tabId,
-  });
-};
-
-const set = (tabId, x, y) => {
-  return ipc.send({
-    type: SCROLL_SET,
-    tabId,
-    x,
-    y,
-  });
-};
-
-export { get, set };
diff --git a/e2e/ambassador/src/client/tabs.js b/e2e/ambassador/src/client/tabs.js
deleted file mode 100644
index d0cd578..0000000
--- a/e2e/ambassador/src/client/tabs.js
+++ /dev/null
@@ -1,60 +0,0 @@
-import {
-  TABS_CREATE, TABS_SELECT_AT, TABS_GET, TABS_UPDATE, TABS_REMOVE,
-  TABS_GET_ZOOM, TABS_SET_ZOOM,
-} from '../shared/messages';
-import * as ipc from './ipc';
-
-const create = (windowId, url) => {
-  return ipc.send({
-    type: TABS_CREATE,
-    windowId,
-    url,
-  });
-};
-
-const selectAt = (windowId, index) => {
-  return ipc.send({
-    type: TABS_SELECT_AT,
-    windowId,
-    index,
-  });
-};
-
-const get = (tabId) => {
-  return ipc.send({
-    type: TABS_GET,
-    tabId,
-  });
-};
-
-const update = (tabId, properties) => {
-  return ipc.send({
-    type: TABS_UPDATE,
-    tabId,
-    properties,
-  });
-};
-
-const remove = (tabId) => {
-  return ipc.send({
-    type: TABS_REMOVE,
-    tabId
-  });
-};
-
-const getZoom = (tabId) => {
-  return ipc.send({
-    tabId,
-    type: TABS_GET_ZOOM,
-  });
-};
-
-const setZoom = (tabId, factor) => {
-  return ipc.send({
-    type: TABS_SET_ZOOM,
-    tabId,
-    factor,
-  });
-};
-
-export { create, selectAt, get, update, remove, getZoom, setZoom };
diff --git a/e2e/ambassador/src/client/windows.js b/e2e/ambassador/src/client/windows.js
deleted file mode 100644
index f92405a..0000000
--- a/e2e/ambassador/src/client/windows.js
+++ /dev/null
@@ -1,27 +0,0 @@
-import {
-  WINDOWS_CREATE, WINDOWS_REMOVE, WINDOWS_GET
-} from '../shared/messages';
-import * as ipc from './ipc';
-
-const create = (url) => {
-  return ipc.send({
-    type: WINDOWS_CREATE,
-    url,
-  });
-};
-
-const remove = (windowId) => {
-  return ipc.send({
-    type: WINDOWS_REMOVE,
-    windowId,
-  });
-};
-
-const get = (windowId) => {
-  return ipc.send({
-    type: WINDOWS_GET,
-    windowId,
-  });
-};
-
-export { create, remove, get };
diff --git a/e2e/ambassador/src/content/events.js b/e2e/ambassador/src/content/events.js
deleted file mode 100644
index 1e45909..0000000
--- a/e2e/ambassador/src/content/events.js
+++ /dev/null
@@ -1,31 +0,0 @@
-const keypress = (opts) => {
-  let event = new KeyboardEvent('keypress', {
-    key: opts.key,
-    altKey: opts.altKey,
-    shiftKey: opts.shiftKey,
-    ctrlKey: opts.ctrlKey
-  });
-  document.body.dispatchEvent(event);
-};
-
-const keydown = (opts) => {
-  let event = new KeyboardEvent('keydown', {
-    key: opts.key,
-    altKey: opts.altKey,
-    shiftKey: opts.shiftKey,
-    ctrlKey: opts.ctrlKey
-  });
-  document.body.dispatchEvent(event);
-};
-
-const keyup = (opts) => {
-  let event = new KeyboardEvent('keyup', {
-    key: opts.key,
-    altKey: opts.altKey,
-    shiftKey: opts.shiftKey,
-    ctrlKey: opts.ctrlKey
-  });
-  document.body.dispatchEvent(event);
-};
-
-export { keypress, keydown, keyup };
diff --git a/e2e/ambassador/src/content/index.js b/e2e/ambassador/src/content/index.js
deleted file mode 100644
index fd19136..0000000
--- a/e2e/ambassador/src/content/index.js
+++ /dev/null
@@ -1,30 +0,0 @@
-import {
-  EVENT_KEYPRESS, EVENT_KEYDOWN, EVENT_KEYUP,
-  SCROLL_GET, SCROLL_SET,
-} from '../shared/messages';
-import * as ipc from './ipc';
-import * as events from './events';
-import * as scrolls from './scrolls';
-
-ipc.receivePageMessage((message) => {
-  return ipc.sendToBackground(message);
-});
-
-ipc.receiveBackgroundMesssage((message) => {
-  switch (message.type) {
-  case EVENT_KEYPRESS:
-    events.keypress(message);
-    break;
-  case EVENT_KEYDOWN:
-    events.keydown(message);
-    break;
-  case EVENT_KEYUP:
-    events.keyup(message);
-    break;
-  case SCROLL_GET:
-    return Promise.resolve(scrolls.get());
-  case SCROLL_SET:
-    return Promise.resolve(scrolls.set(message.x, message.y));
-  }
-  return Promise.resolve({});
-});
diff --git a/e2e/ambassador/src/content/ipc.js b/e2e/ambassador/src/content/ipc.js
deleted file mode 100644
index 917623c..0000000
--- a/e2e/ambassador/src/content/ipc.js
+++ /dev/null
@@ -1,40 +0,0 @@
-import { METHOD_REQUEST, METHOD_RESPONSE } from '../shared/messages';
-
-const sendToBackground = (message) => {
-  return browser.runtime.sendMessage(message);
-};
-
-const receiveBackgroundMesssage = (func) => {
-  return browser.runtime.onMessage.addListener((message) => {
-    return Promise.resolve(func(message));
-  });
-};
-
-const receivePageMessage = (func) => {
-  window.addEventListener('message', (e) => {
-    let packet = e.data;
-    if (e.origin !== window.origin || packet.method !== METHOD_REQUEST) {
-      return;
-    }
-
-    let resp = {
-      id: packet.id,
-      method: METHOD_RESPONSE,
-    };
-    let respMessage = func(packet.message);
-    if (respMessage instanceof Promise) {
-      return respMessage.then((data) => {
-        resp.message = data;
-        e.source.postMessage(resp, e.origin);
-      });
-    } else if (respMessage) {
-      resp.message = respMessage;
-    }
-    e.source.postMessage(resp, e.origin);
-  });
-};
-
-export {
-  sendToBackground, receiveBackgroundMesssage,
-  receivePageMessage,
-};
diff --git a/e2e/ambassador/src/content/scrolls.js b/e2e/ambassador/src/content/scrolls.js
deleted file mode 100644
index 4227cf7..0000000
--- a/e2e/ambassador/src/content/scrolls.js
+++ /dev/null
@@ -1,20 +0,0 @@
-const get = () => {
-  let element = document.documentElement;
-  return {
-    xMax: element.scrollWidth - element.clientWidth,
-    yMax: element.scrollHeight - element.clientHeight,
-    x: element.scrollLeft,
-    y: element.scrollTop,
-    frameWidth: element.clientWidth,
-    frameHeight: element.clientHeight,
-  };
-};
-
-const set = (x, y) => {
-  let element = document.documentElement;
-  element.scrollLeft = x;
-  element.scrollTop = y;
-  return get();
-};
-
-export { get, set };
diff --git a/e2e/ambassador/src/shared/messages.js b/e2e/ambassador/src/shared/messages.js
deleted file mode 100644
index 35c41d7..0000000
--- a/e2e/ambassador/src/shared/messages.js
+++ /dev/null
@@ -1,40 +0,0 @@
-const METHOD_REQUEST = 'request';
-const METHOD_RESPONSE = 'response';
-const WINDOWS_CREATE = 'windows.create';
-const WINDOWS_REMOVE = 'windows.remove';
-const WINDOWS_GET = 'windows.get';
-const TABS_CREATE = 'tabs.create';
-const TABS_SELECT_AT = 'tabs.selectAt';
-const TABS_GET = 'tabs.get';
-const TABS_UPDATE = 'tabs.update';
-const TABS_REMOVE = 'tabs.remove';
-const TABS_GET_ZOOM = 'tabs.get.zoom';
-const TABS_SET_ZOOM = 'tabs.set.zoom';
-const EVENT_KEYPRESS = 'event.keypress';
-const EVENT_KEYDOWN = 'event.keydown';
-const EVENT_KEYUP = 'event.keyup';
-const SCROLL_GET = 'scroll.get';
-const SCROLL_SET = 'scroll.set';
-
-export {
-  METHOD_REQUEST,
-  METHOD_RESPONSE,
-
-  WINDOWS_CREATE,
-  WINDOWS_REMOVE,
-  WINDOWS_GET,
-
-  TABS_GET,
-  TABS_UPDATE,
-  TABS_CREATE,
-  TABS_SELECT_AT,
-  TABS_GET_ZOOM,
-  TABS_SET_ZOOM,
-  TABS_REMOVE,
-
-  EVENT_KEYPRESS,
-  EVENT_KEYDOWN,
-  EVENT_KEYUP,
-  SCROLL_GET,
-  SCROLL_SET,
-};
diff --git a/e2e/ambassador/webpack.config.js b/e2e/ambassador/webpack.config.js
deleted file mode 100644
index d292317..0000000
--- a/e2e/ambassador/webpack.config.js
+++ /dev/null
@@ -1,24 +0,0 @@
-const path = require('path');
-
-const src = path.resolve(__dirname, 'src');
-const dist = path.resolve(__dirname, 'build');
-
-config = {
-  entry: {
-    content: path.join(src, 'content'),
-    background: path.join(src, 'background')
-  },
-
-  output: {
-    path: dist,
-    filename: '[name].js'
-  },
-
-  resolve: {
-    extensions: [ '.js' ],
-    modules: [path.join(__dirname, 'src'), 'node_modules']
-  }
-};
-
-module.exports = config
-
diff --git a/e2e/contents/follow.test.js b/e2e/contents/follow.test.js
deleted file mode 100644
index f78780b..0000000
--- a/e2e/contents/follow.test.js
+++ /dev/null
@@ -1,83 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("tab test", () => {
-  let targetWindow;
-
-  beforeEach(async () => {
-    targetWindow = await windows.create(CLIENT_URL);
-  });
-
-  afterEach(async () => {
-    await windows.remove(targetWindow.id);
-  });return
-
-  it('follows link by `f`', async() => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/follow');
-    await keys.press(tab.id, 'f');
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-    await keys.press(tab.id, 'a');
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-
-    tab =  tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/follow#a');
-  });
-
-  it('follows link into new tab by `F`', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/follow');
-    await keys.press(tab.id, 'F', { shiftKey: true });
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-    await keys.press(tab.id, 'a');
-    await new Promise(resolve => { setTimeout(() => resolve(), 500) });
-
-    let win = await windows.get(targetWindow.id);
-    let urls = win.tabs.map(t => t.url);
-    expect(urls).to.have.lengthOf(3);
-    expect(urls).to.include(CLIENT_URL + '/');
-    expect(urls).to.include(CLIENT_URL + '/follow');
-    expect(urls).to.include(CLIENT_URL + '/follow#a');
-  });
-
-  it('follows link with target=_blank into new tab by `f`', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/follow');
-    await keys.press(tab.id, 'f');
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-    await keys.press(tab.id, 'b');
-    await new Promise(resolve => { setTimeout(() => resolve(), 500) });
-
-    let win = await windows.get(targetWindow.id);
-    let urls = win.tabs.map(t => t.url);
-    expect(urls).to.have.lengthOf(3);
-    expect(urls).to.include(CLIENT_URL + '/');
-    expect(urls).to.include(CLIENT_URL + '/follow');
-    expect(urls).to.include(CLIENT_URL + '/follow#external');
-  });
-
-  it('follows link with target=_blank into new tab by `F`', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/follow');
-    await keys.press(tab.id, 'F', { shiftKey: true });
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-    await keys.press(tab.id, 'b');
-    await new Promise(resolve => { setTimeout(() => resolve(), 500) });
-
-    let win = await windows.get(targetWindow.id);
-    let urls = win.tabs.map(t => t.url);
-    expect(urls).to.have.lengthOf(3);
-    expect(urls).to.include(CLIENT_URL + '/');
-    expect(urls).to.include(CLIENT_URL + '/follow');
-    expect(urls).to.include(CLIENT_URL + '/follow#external');
-  });
-
-  it('follows area by `F`', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/follow');
-    await keys.press(tab.id, 'f');
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-    await keys.press(tab.id, 'c');
-    await new Promise(resolve => { setTimeout(() => resolve(), 10) });
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/follow#area');
-  });
-});
diff --git a/e2e/contents/mark.test.js b/e2e/contents/mark.test.js
deleted file mode 100644
index 85566bd..0000000
--- a/e2e/contents/mark.test.js
+++ /dev/null
@@ -1,71 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import * as scrolls from "../ambassador/src/client/scrolls";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("mark test", () => {
-  let targetWindow;
-
-  before(async () => {
-    targetWindow = await windows.create();
-  });
-
-  after(async () => {
-    await windows.remove(targetWindow.id);
-  });
-
-  it('set a local mark and jump to it', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/mark#local');
-    await scrolls.set(tab.id, 100, 100);
-    await keys.press(tab.id, 'm');
-    await keys.press(tab.id, 'a');
-
-    await scrolls.set(tab.id, 200, 200);
-    await keys.press(tab.id, "'");
-    await keys.press(tab.id, 'a');
-
-    let scroll = await scrolls.get(tab.id);
-    expect(scroll.x).to.be.equals(100);
-    expect(scroll.y).to.be.equals(100);
-  });
-
-  it('set a global mark and jump to it', async () => {
-    let tab1 = await tabs.create(targetWindow.id, CLIENT_URL + '/mark#global1');
-    await scrolls.set(tab1.id, 100, 100);
-    await keys.press(tab1.id, 'm');
-    await keys.press(tab1.id, 'A');
-    await new Promise(resolve => { setTimeout(() => resolve(), 100) });
-    await scrolls.set(tab1.id, 200, 200);
-
-    let tab2 = await tabs.create(targetWindow.id, CLIENT_URL + '/mark#global2');
-    await keys.press(tab2.id, "'");
-    await keys.press(tab2.id, 'A');
-    await new Promise(resolve => { setTimeout(() => resolve(), 100) });
-
-    tab1 = await tabs.get(tab1.id);
-    expect(tab1.active).to.be.true;
-    let scroll = await scrolls.get(tab1.id);
-    expect(scroll.x).to.be.equals(100);
-    expect(scroll.y).to.be.equals(100);
-  });
-
-  it('set a global mark and creates new tab from gone', async () => {
-    let tab1 = await tabs.create(targetWindow.id, CLIENT_URL + '/mark#gone');
-    await scrolls.set(tab1.id, 100, 100);
-    await keys.press(tab1.id, 'm');
-    await keys.press(tab1.id, 'A');
-    await tabs.remove(tab1.id);
-    await new Promise(resolve => { setTimeout(() => resolve(), 100) });
-
-    let tab2 = await tabs.create(targetWindow.id, CLIENT_URL + '/mark#newtab');
-    await keys.press(tab2.id, "'");
-    await keys.press(tab2.id, 'A');
-    await new Promise(resolve => { setTimeout(() => resolve(), 100) });
-
-    let win = await windows.get(targetWindow.id);
-    let found = win.tabs.find(tab => tab.url === CLIENT_URL + '/mark#gone')
-    expect(found).to.be.an('object');
-    expect(found.id).to.not.equal(tab1.id);
-  });
-});
diff --git a/e2e/contents/navigate.test.js b/e2e/contents/navigate.test.js
deleted file mode 100644
index 32ed423..0000000
--- a/e2e/contents/navigate.test.js
+++ /dev/null
@@ -1,102 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import * as scrolls from "../ambassador/src/client/scrolls";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("navigate test", () => {
-  let targetWindow;
-
-  before(async () => {
-    targetWindow = await windows.create();
-    await tabs.create(targetWindow.id, CLIENT_URL);
-  });
-
-  after(async () => {
-    await windows.remove(targetWindow.id);
-  });
-
-  it('goes to parent', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/a/b/c');
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, 'u');
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/a/b/');
-  });
-
-  it('removes hash', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/a/b/c#navigate');
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, 'u');
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/a/b/c#');
-  });
-
-  it('goes to root', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/a/b/c');
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, 'U', { shiftKey: true });
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/');
-  });
-
-  it('goes back and forward in history', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/#navigate');
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, 'u');
-    await keys.press(tab.id, 'H', { shiftKey: true });
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url, 'go back in history').to.be.equal(CLIENT_URL + '/#navigate');
-    await new Promise((resolve) => setTimeout(resolve, 10));
-    await keys.press(tab.id, 'L', { shiftKey: true });
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url, 'go next in history').to.be.equal(CLIENT_URL + '/#');
-  });
-
-  it('goes previous page by <a>', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/a-pagenation?page=10');
-    await keys.press(tab.id, '[');
-    await keys.press(tab.id, '[');
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/a-pagenation?page=9');
-  })
-
-  it('goes next page by <a>', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/a-pagenation?page=10');
-    await keys.press(tab.id, ']');
-    await keys.press(tab.id, ']');
-    await new Promise((resolve) => setTimeout(resolve, 100));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/a-pagenation?page=11');
-  })
-
-  it('goes previous page by <link>', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/link-pagenation?page=10');
-    await keys.press(tab.id, '[');
-    await keys.press(tab.id, '[');
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/link-pagenation?page=9');
-  })
-
-  it('goes next page by <link>', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '/link-pagenation?page=10');
-    await keys.press(tab.id, ']');
-    await keys.press(tab.id, ']');
-    await new Promise((resolve) => setTimeout(resolve, 10));
-
-    tab = await tabs.get(tab.id);
-    expect(tab.url).to.be.equal(CLIENT_URL + '/link-pagenation?page=11');
-  })
-});
diff --git a/e2e/contents/scroll.test.js b/e2e/contents/scroll.test.js
deleted file mode 100644
index f364890..0000000
--- a/e2e/contents/scroll.test.js
+++ /dev/null
@@ -1,106 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import * as scrolls from "../ambassador/src/client/scrolls";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("scroll test", () => {
-  let targetWindow;
-  let targetTab;
-
-  before(async () => {
-    targetWindow = await windows.create();
-    targetTab = await tabs.create(targetWindow.id, CLIENT_URL + '/scroll');
-  });
-
-  after(async () => {
-    await windows.remove(targetWindow.id);
-  });
-
-  it('scrolls up by k', async () => {
-    let before = await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, 'k');
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.be.lessThan(before.y);
-  });
-
-  it('scrolls down by j', async () => {
-    let before = await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, 'j');
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.be.greaterThan(before.y);
-  });
-
-  it('scrolls left by h', async () => {
-    let before = await scrolls.set(targetTab.id, 100, 100)
-    await keys.press(targetTab.id, 'h');
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.x).to.be.lessThan(before.x);
-  });
-
-  it('scrolls top by gg', async () => {
-    await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, 'g');
-    await keys.press(targetTab.id, 'g');
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.be.equals(0);
-  });
-
-  it('scrolls bottom by G', async () => {
-    await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, 'G', { shiftKey: true });
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.be.equals(actual.yMax);
-  });
-
-  it('scrolls bottom by 0', async () => {
-    await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, '0');
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.x).to.be.equals(0);
-  });
-
-  it('scrolls bottom by $', async () => {
-    await scrolls.set(targetTab.id, 100, 100);
-    await keys.press(targetTab.id, '$');
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.x).to.be.equals(actual.xMax);
-  });
-
-  it('scrolls bottom by <C-U>', async () => {
-    let before = await scrolls.set(targetTab.id, 5000, 5000);
-    await keys.press(targetTab.id, 'u', { ctrlKey: true });
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.closeTo(before.y - before.frameHeight / 2, 1);
-  });
-
-  it('scrolls bottom by <C-D>', async () => {
-    let before = await scrolls.set(targetTab.id, 5000, 5000);
-    await keys.press(targetTab.id, 'd', { ctrlKey: true });
-
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.closeTo(before.y + before.frameHeight / 2, 1);
-  });
-
-  it('scrolls bottom by <C-B>', async () => {
-    let before = await scrolls.set(targetTab.id, 5000, 5000);
-    await keys.press(targetTab.id, 'b', { ctrlKey: true });
-
-    let actual = await await scrolls.get(targetTab.id);
-    expect(actual.y).to.equals(before.y - before.frameHeight);
-  });
-
-  it('scrolls bottom by <C-F>', async () => {
-    let before = await scrolls.set(targetTab.id, 5000, 5000);
-    await keys.press(targetTab.id, 'f', { ctrlKey: true });
-    let actual = await scrolls.get(targetTab.id);
-    expect(actual.y).to.equals(before.y + before.frameHeight);
-  });
-});
diff --git a/e2e/contents/tab.test.js b/e2e/contents/tab.test.js
deleted file mode 100644
index 3c98dc9..0000000
--- a/e2e/contents/tab.test.js
+++ /dev/null
@@ -1,192 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("tab test", () => {
-  let targetWindow;
-
-  beforeEach(async () => {
-    targetWindow = await windows.create(CLIENT_URL);
-  });
-
-  afterEach(async () => {
-    await windows.remove(targetWindow.id);
-  });
-
-  it('deletes tab by d', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL);
-    let before = await windows.get(targetWindow.id);
-    await keys.press(tab.id, 'd');
-
-    let actual = await windows.get(targetWindow.id);
-    expect(actual.tabs).to.have.lengthOf(before.tabs.length - 1);
-  });
-
-  it('deletes tabs to the right by D', async () => {
-    let tab1 = await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-
-    let before = await windows.get(targetWindow.id)
-    let tab = await tabs.selectAt(targetWindow.id, tab1.index)
-    await keys.press(tab.id, 'D', { shiftKey: true });
-
-    let actual = await windows.get(targetWindow.id);
-    expect(actual.tabs).to.have.lengthOf(before.tabs.length - 2);
-  });
-
-  it('duplicates tab by zd', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL);
-    let before = await windows.get(targetWindow.id)
-    await keys.press(tab.id, 'z');
-    await keys.press(tab.id, 'd');
-
-    let actual = await windows.get(targetWindow.id);
-    expect(actual.tabs).to.have.lengthOf(before.tabs.length + 1);
-  });
-
-  it('makes pinned by zp', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL);
-    let before = await windows.get(targetWindow.id);
-    await keys.press(tab.id, 'z');
-    await keys.press(tab.id, 'p');
-
-    let actual = await windows.get(targetWindow.id);
-    expect(actual.tabs[0].pinned).to.be.true;
-  });
-
-  it('selects previous tab by K', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 2);
-    await keys.press(tab.id, 'K', { shiftKey: true });
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[1].active).to.be.true;
-  });
-
-  it('selects previous tab by K rotatory', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 0);
-    await keys.press(tab.id, 'K', { shiftKey: true });
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[3].active).to.be.true;
-  });
-
-  it('selects next tab by J', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 2);
-    await keys.press(tab.id, 'J', { shiftKey: true });
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[3].active).to.be.true;
-  });
-
-  it('selects previous tab by J rotatory', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 3);
-    await keys.press(tab.id, 'J', { shiftKey: true });
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[0].active).to.be.true;
-  });
-
-  it('selects first tab by g0', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 2);
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, '0');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[0].active).to.be.true;
-  });
-
-  it('selects last tab by g$', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    let tab = await tabs.selectAt(targetWindow.id, 2);
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, '$');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[3].active).to.be.true;
-  });
-
-  it('selects last selected tab by <C-6>', async () => {
-    await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#2');
-    await tabs.create(targetWindow.id, CLIENT_URL + '#3');
-    await tabs.selectAt(targetWindow.id, 1);
-    let tab = await tabs.selectAt(targetWindow.id, 3);
-    await keys.press(tab.id, '6', { ctrlKey: true });
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs[1].active).to.be.true;
-  });
-
-  it('deletes tab by d', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await keys.press(tab.id, 'd');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs).to.have.lengthOf(1);
-  });
-
-  it('reopen tab by u', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    await keys.press(tab.id, 'd');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs).to.have.lengthOf(1);
-
-    await keys.press(win.tabs[0].id, 'u');
-    await new Promise(resolve => setTimeout(resolve, 100));
-
-    win = await windows.get(targetWindow.id);
-    expect(win.tabs).to.have.lengthOf(2);
-  });
-
-  it('does not delete pinned tab by d', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    tab = await tabs.update(tab.id, { pinned: true });
-    await keys.press(tab.id, 'd');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs).to.have.lengthOf(2);
-  });
-
-  it('deletes pinned tab by !d', async () => {
-    let tab = await tabs.create(targetWindow.id, CLIENT_URL + '#1');
-    tab = await tabs.update(tab.id, { pinned: true });
-    await keys.press(tab.id, '!');
-    await keys.press(tab.id, 'd');
-
-    let win = await windows.get(targetWindow.id);
-    expect(win.tabs).to.have.lengthOf(1);
-  });
-
-  it('opens view-source by gf', async () => {
-    await new Promise(resolve => setTimeout(resolve, 100));
-    let win = await windows.get(targetWindow.id);
-    let tab = win.tabs[0];
-    await keys.press(tab.id, 'g');
-    await keys.press(tab.id, 'f');
-    await new Promise(resolve => setTimeout(resolve, 500));
-
-    win = await windows.get(targetWindow.id);
-    let urls = win.tabs.map((t) => t.url)
-    expect(urls).to.include.members([CLIENT_URL + '/', 'view-source:' + CLIENT_URL + '/']);
-  });
-});
diff --git a/e2e/contents/zoom.test.js b/e2e/contents/zoom.test.js
deleted file mode 100644
index 74d4f56..0000000
--- a/e2e/contents/zoom.test.js
+++ /dev/null
@@ -1,53 +0,0 @@
-import * as windows from "../ambassador/src/client/windows";
-import * as tabs from "../ambassador/src/client/tabs";
-import * as keys from "../ambassador/src/client/keys";
-import { CLIENT_URL } from '../web-server/url';
-
-describe("zoom test", () => {
-  let targetWindow;
-  let targetTab;
-
-  before(async () => {
-    targetWindow = await windows.create(CLIENT_URL);
-  });
-
-  after(async () => {
-    await windows.remove(targetWindow.id);
-  });
-
-  beforeEach(async () => {
-    targetTab = await tabs.create(targetWindow.id, CLIENT_URL);
-  });
-
-  it('zooms-in by zi', async () => {
-    let before = await tabs.getZoom(targetTab.id);
-    await keys.press(targetTab.id, 'z');
-    await keys.press(targetTab.id, 'i');
-    await new Promise(resolve => setTimeout(resolve, 100));
-
-    let actual = await tabs.getZoom(targetTab.id);
-    expect(actual).to.be.greaterThan(before);
-  });
-
-  it('zooms-in by zo', async () => {
-    let before = await tabs.getZoom(targetTab.id);
-    await keys.press(targetTab.id, 'z');
-    await keys.press(targetTab.id, 'o');
-    await new Promise(resolve => setTimeout(resolve, 100));
-
-    let actual = await tabs.getZoom(targetTab.id);
-    expect(actual).to.be.lessThan(before);
-  });
-
-  it('zooms-in by zz', async () => {
-    await tabs.setZoom(targetTab.id, 1.5);
-    let before = await tabs.getZoom(targetTab.id);
-    await keys.press(targetTab.id, 'z');
-    await keys.press(targetTab.id, 'z');
-    await new Promise(resolve => setTimeout(resolve, 100));
-
-    let actual = await tabs.getZoom(targetTab.id);
-    expect(actual).to.be.lessThan(before);
-    expect(actual).to.equal(1);
-  });
-});
diff --git a/e2e/eventually.js b/e2e/eventually.js
new file mode 100644
index 0000000..ab0ae25
--- /dev/null
+++ b/e2e/eventually.js
@@ -0,0 +1,23 @@
+let defaultInterval = 100;
+let defaultTimeout = 2000;
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+ 
+const eventually = async (fn, timeout = defaultTimeout, interval = defaultInterval) => {
+  let start = Date.now();
+  let loop = async() => {
+    try {
+      await fn();
+    } catch (err) {
+      if (Date.now() - start > timeout) {
+        throw err;
+      }
+      await new Promise((resolve) => setTimeout(resolve, interval))
+      await loop();
+    }
+  };
+  await loop();
+};
+module.exports = eventually;
diff --git a/e2e/karma-delay.js b/e2e/karma-delay.js
deleted file mode 100644
index 7d18c4a..0000000
--- a/e2e/karma-delay.js
+++ /dev/null
@@ -1,10 +0,0 @@
-'use strict';
-
-window.__karma__.start = (function(start){
-return function(){
-  var args = arguments
-  setTimeout(() => {
-    start(args)
-  }, 3000);
-};
-}(window.__karma__.start));
diff --git a/e2e/karma-webext-launcher.js b/e2e/karma-webext-launcher.js
deleted file mode 100644
index e0a3e42..0000000
--- a/e2e/karma-webext-launcher.js
+++ /dev/null
@@ -1,53 +0,0 @@
-'use strict'
-
-var fs = require('fs')
-var path = require('path')
-
-var PREFS = {
-  'browser.shell.checkDefaultBrowser': 'false',
-  'browser.bookmarks.restore_default_bookmarks': 'false',
-  'dom.disable_open_during_load': 'false',
-  'dom.max_script_run_time': '0',
-  'dom.min_background_timeout_value': '10',
-  'extensions.autoDisableScopes': '0',
-  'extensions.enabledScopes': '15',
-}
-
-var FirefoxWebExt = function (id, baseBrowserDecorator, args) {
-  baseBrowserDecorator(this)
-
-  this._start = function (url) {
-    var self = this
-    var command = this._getCommand()
-
-    let prefArgs = [].concat(...Object.keys(PREFS).map((key) => {
-      return ['--pref', key + '=' + PREFS[key]];
-    }));
-    let sourceDirArgs = [].concat(...args.sourceDirs.map((dir) => {
-      return ['--source-dir', dir];
-    }));
-
-    self._execCommand(
-      command,
-      ['run', '--start-url', url, '--no-input'].concat(sourceDirArgs, prefArgs)
-    )
-  }
-}
-
-FirefoxWebExt.prototype = {
-  name: 'FirefoxWebExt',
-
-  DEFAULT_CMD: {
-    linux: 'node_modules/web-ext/bin/web-ext',
-    darwin: 'node_modules/web-ext/bin/web-ext',
-    win32: 'node_modules/web-ext/bin/web-ext',
-  }
-}
-
-FirefoxWebExt.$inject = ['id', 'baseBrowserDecorator', 'args']
-
-// PUBLISH DI MODULE
-module.exports = {
-  'launcher:FirefoxWebExt': ['type', FirefoxWebExt],
-}
-
diff --git a/e2e/karma.conf.js b/e2e/karma.conf.js
deleted file mode 100644
index fcda415..0000000
--- a/e2e/karma.conf.js
+++ /dev/null
@@ -1,53 +0,0 @@
-module.exports = function (config) {
-
-  config.set({
-    basePath: '',
-    frameworks: ['mocha'],
-    files: [
-      'main.js',
-      'karma-delay.js',
-      '**/*.test.js'
-    ],
-
-    preprocessors: {
-      '**/main.js': ['webpack'],
-      '**/*.test.js': ['webpack']
-    },
-
-    port: 9876,
-    colors: true,
-    logLevel: config.LOG_INFO,
-
-    customLaunchers: {
-      FirefoxWebExtRunner: {
-        base: 'FirefoxWebExt',
-        sourceDirs: [ '.', 'e2e/ambassador'],
-      },
-    },
-    browsers: ['FirefoxWebExtRunner'],
-    sauceLabs: {
-      username: 'michael_jackson'
-    },
-
-    singleRun: true,
-
-    webpackMiddleware: {
-      noInfo: true
-    },
-
-    reporters: ['mocha'],
-
-    plugins: [
-      require('./karma-webext-launcher'),
-      'karma-mocha',
-      'karma-webpack',
-      'karma-mocha-reporter',
-    ],
-
-    client: {
-      mocha: {
-        timeout: 5000
-      }
-    }
-  })
-}
diff --git a/e2e/main.js b/e2e/main.js
deleted file mode 100644
index d923aaa..0000000
--- a/e2e/main.js
+++ /dev/null
@@ -1,2 +0,0 @@
-import chai from 'chai';
-global.expect = chai.expect;
diff --git a/e2e/mark.test.js b/e2e/mark.test.js
new file mode 100644
index 0000000..8f350b7
--- /dev/null
+++ b/e2e/mark.test.js
@@ -0,0 +1,121 @@
+const express = require('express');
+const lanthan = require('lanthan');
+const path = require('path');
+const assert = require('assert');
+const eventually = require('./eventually');
+
+const Key = lanthan.Key;
+
+const newApp = () => {
+  let app = express();
+  app.get('/', (req, res) => {
+    res.send(`<!DOCTYPEhtml>
+<html lang="en">
+  <body style="width:10000px; height:10000px"></body>
+</html">`);
+  });
+  return app;
+};
+
+describe("mark test", () => {
+
+  const port = 12321;
+  let http;
+  let firefox;
+  let session;
+  let browser;
+
+  before(async() => {
+    http = newApp().listen(port);
+
+    firefox = await lanthan.firefox();
+    await firefox.session.installAddon(path.join(__dirname, '..'));
+    session = firefox.session;
+    browser = firefox.browser;
+  });
+
+  after(async() => {
+    if (firefox) {
+      await firefox.close();
+    }
+    http.close();
+  });
+
+  it('should set a local mark and jump to it', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}`);
+    let body = await session.findElementByCSS('body');
+
+    await session.executeScript(() => window.scrollTo(200, 200));
+    await body.sendKeys('m', 'a');
+    await session.executeScript(() => window.scrollTo(500, 500));
+    await body.sendKeys('\'', 'a');
+
+    await eventually(async() => {
+      let pageXOffset = await session.executeScript(() => window.pageXOffset);
+      let pageYOffset = await session.executeScript(() => window.pageYOffset);
+      assert.equal(pageXOffset, 200);
+      assert.equal(pageYOffset, 200);
+    });
+  });
+
+  it('should set a global mark and jump to it', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}#first`);
+    let body = await session.findElementByCSS('body');
+
+    await session.executeScript(() => window.scrollTo(200, 200));
+    await body.sendKeys('m', 'A');
+    await session.executeScript(() => window.scrollTo(500, 500));
+    await body.sendKeys('\'', 'A');
+
+    await eventually(async() => {
+      let pageXOffset = await session.executeScript(() => window.pageXOffset);
+      let pageYOffset = await session.executeScript(() => window.pageYOffset);
+      assert.equal(pageXOffset, 200);
+      assert.equal(pageYOffset, 200);
+    });
+
+    await browser.tabs.create({ url: `http://127.0.0.1:${port}#second` });
+    body = await session.findElementByCSS('body');
+    await body.sendKeys('\'', 'A');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({ active: true }))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.hash, '#first');
+
+      let pageXOffset = await session.executeScript(() => window.pageXOffset);
+      let pageYOffset = await session.executeScript(() => window.pageYOffset);
+      assert.equal(pageXOffset, 200);
+      assert.equal(pageYOffset, 200);
+    });
+  });
+
+  it('set a global mark and creates new tab from gone', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}#first`);
+    await session.executeScript(() => window.scrollTo(500, 500));
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('m', 'A');
+
+    let tab = (await browser.tabs.query({ active: true }))[0];
+    await browser.tabs.create({ url: `http://127.0.0.1:${port}#second` });
+    await browser.tabs.remove(tab.id);
+
+    let handles;
+    await eventually(async() => {
+      handles = await session.getWindowHandles();
+      assert.equal(handles.length, 2);
+    });
+    await session.switchToWindow(handles[0]);
+    await session.navigateTo(`http://127.0.0.1:${port}#second`);
+    body = await session.findElementByCSS('body');
+    await body.sendKeys('\'', 'A');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({ active: true }))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.hash, '#first');
+    });
+  });
+});
+
+
diff --git a/e2e/navigate.test.js b/e2e/navigate.test.js
new file mode 100644
index 0000000..089fa56
--- /dev/null
+++ b/e2e/navigate.test.js
@@ -0,0 +1,167 @@
+const express = require('express');
+const lanthan = require('lanthan');
+const path = require('path');
+const assert = require('assert');
+const eventually = require('./eventually');
+
+const Key = lanthan.Key;
+
+const newApp = () => {
+  let app = express();
+  app.get('/pagenation-a/:page', (req, res) => {
+    res.status(200).send(`
+<html lang="en">
+  <a href="/pagenation-a/${Number(req.params.page) - 1}">prev</a>
+  <a href="/pagenation-a/${Number(req.params.page) + 1}">next</a>
+</html">`);
+  });
+  app.get('/pagenation-link/:page', (req, res) => {
+    res.status(200).send(`
+<html lang="en">
+  <head>
+    <link rel="prev" href="/pagenation-link/${Number(req.params.page) - 1}"></link>
+    <link rel="next" href="/pagenation-link/${Number(req.params.page) + 1}"></link>
+  </head>
+</html">`);
+  });
+
+  app.get('/*', (req, res) => {
+    res.send(`<!DOCTYPEhtml>
+<html lang="en">
+  ${req.path}
+</html">`);
+  });
+  return app;
+};
+
+describe("zoom test", () => {
+
+  const port = 12321;
+  let http;
+  let firefox;
+  let session;
+  let browser;
+
+  before(async() => {
+    http = newApp().listen(port);
+
+    firefox = await lanthan.firefox();
+    await firefox.session.installAddon(path.join(__dirname, '..'));
+    session = firefox.session;
+    browser = firefox.browser;
+  });
+
+  after(async() => {
+    if (firefox) {
+      await firefox.close();
+    }
+    http.close();
+  });
+
+  it('should go to parent path without hash by gu', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/a/b/c`);
+    let body = await session.findElementByCSS('body');
+
+    await body.sendKeys('g', 'u');
+
+    let tab = (await browser.tabs.query({}))[0];
+    let url = new URL(tab.url);
+    assert.equal(url.pathname, `/a/b/`)
+  });
+
+  it('should remove hash by gu', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/a/b/c#hash`);
+    let body = await session.findElementByCSS('body');
+
+    await body.sendKeys('g', 'u');
+
+    let tab = (await browser.tabs.query({}))[0];
+    let url = new URL(tab.url);
+    assert.equal(url.hash, '')
+    assert.equal(url.pathname, `/a/b/c`)
+  });
+
+  it('should go to root path by gU', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/a/b/c#hash`);
+    let body = await session.findElementByCSS('body');
+
+    await body.sendKeys('g', Key.Shift, 'u');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({}))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.pathname, `/`)
+    });
+  });
+
+  it('should go back and forward in history by H and L', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/first`);
+    await session.navigateTo(`http://127.0.0.1:${port}/second`);
+    let body = await session.findElementByCSS('body');
+
+    await body.sendKeys(Key.Shift, 'h');
+
+    let tab = (await browser.tabs.query({}))[0];
+    let url = new URL(tab.url);
+    assert.equal(url.pathname, `/first`)
+
+    body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'l');
+
+    tab = (await browser.tabs.query({}))[0];
+    url = new URL(tab.url);
+    assert.equal(url.pathname, `/second`)
+  });
+
+  it('should go previous and next page in <a> by [[ and ]]', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/pagenation-a/10`);
+
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('[', '[');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({}))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.pathname, '/pagenation-a/9');
+    });
+  });
+
+  it('should go next page in <a> by ]]', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/pagenation-a/10`);
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(']', ']');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({}))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.pathname, '/pagenation-a/11');
+    });
+  });
+
+  it('should go previous page in <link> by ]]', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/pagenation-link/10`);
+
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('[', '[');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({}))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.pathname, '/pagenation-link/9');
+    });
+  });
+
+  it('should go next page by in <link> by [[', async () => {
+    await session.navigateTo(`http://127.0.0.1:${port}/pagenation-link/10`);
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(']', ']');
+
+    await eventually(async() => {
+      let tab = (await browser.tabs.query({}))[0];
+      let url = new URL(tab.url);
+      assert.equal(url.pathname, '/pagenation-link/11');
+    });
+  });
+});
+
+
diff --git a/e2e/scroll.test.js b/e2e/scroll.test.js
new file mode 100644
index 0000000..32b0012
--- /dev/null
+++ b/e2e/scroll.test.js
@@ -0,0 +1,150 @@
+const express = require('express');
+const lanthan = require('lanthan');
+const path = require('path');
+const assert = require('assert');
+
+const Key = lanthan.Key;
+
+const newApp = () => {
+  let app = express();
+  app.get('/', (req, res) => {
+    res.send(`<!DOCTYPEhtml>
+<html lang="en">
+  <body style="width:10000px; height:10000px"></body>
+</html">`);
+  });
+  return app;
+};
+
+describe("scroll test", () => {
+
+  const port = 12321;
+  let http;
+  let firefox;
+  let session;
+  let body;
+
+  before(async() => {
+    http = newApp().listen(port);
+
+    firefox = await lanthan.firefox();
+    await firefox.session.installAddon(path.join(__dirname, '..'));
+    session = firefox.session;
+  });
+
+  after(async() => {
+    if (firefox) {
+      await firefox.close();
+    }
+    http.close();
+  });
+
+  beforeEach(async() => {
+    await session.navigateTo(`http://127.0.0.1:${port}`);
+    body = await session.findElementByCSS('body');
+  });
+
+
+  it('scrolls up by k', async () => {
+    await body.sendKeys('j');
+
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert.equal(pageYOffset, 64);
+  });
+
+  it('scrolls down by j', async () => {
+    await session.executeScript(() => window.scrollTo(0, 200));
+    await body.sendKeys('k');
+
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert.equal(pageYOffset, 136);
+  });
+
+  it('scrolls left by h', async () => {
+    await session.executeScript(() => window.scrollTo(100, 100));
+    await body.sendKeys('h');
+
+    let pageXOffset = await session.executeScript(() => window.pageXOffset);
+    assert.equal(pageXOffset, 36);
+  });
+
+  it('scrolls left by l', async () => {
+    await session.executeScript(() => window.scrollTo(100, 100));
+    await body.sendKeys('l');
+
+    let pageXOffset = await session.executeScript(() => window.pageXOffset);
+    assert.equal(pageXOffset, 164);
+  });
+
+  it('scrolls top by gg', async () => {
+    await session.executeScript(() => window.scrollTo(0, 100));
+    await body.sendKeys('g', 'g');
+
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert.equal(pageYOffset, 0);
+  });
+
+  it('scrolls bottom by G', async () => {
+    await session.executeScript(() => window.scrollTo(0, 100));
+    await body.sendKeys(Key.Shift, 'g');
+
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert(pageYOffset > 5000);
+  });
+
+  it('scrolls bottom by 0', async () => {
+    await session.executeScript(() => window.scrollTo(0, 100));
+    await body.sendKeys(Key.Shift, '0');
+
+    let pageXOffset = await session.executeScript(() => window.pageXOffset);
+    assert(pageXOffset === 0);
+  });
+
+  it('scrolls bottom by $', async () => {
+    await session.executeScript(() => window.scrollTo(0, 100));
+    await body.sendKeys(Key.Shift, '$');
+
+    let pageXOffset = await session.executeScript(() => window.pageXOffset);
+    assert(pageXOffset > 5000);
+  });
+
+  it('scrolls bottom by <C-U>', async () => {
+    await session.executeScript(() => window.scrollTo(0, 1000));
+    await body.sendKeys(Key.Control, 'u');
+
+    let pageHeight = 
+      await session.executeScript(() => window.document.documentElement.clientHeight);
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert(Math.abs(pageYOffset - (1000 - Math.floor(pageHeight / 2))) < 5);
+  });
+
+  it('scrolls bottom by <C-D>', async () => {
+    await session.executeScript(() => window.scrollTo(0, 1000));
+    await body.sendKeys(Key.Control, 'd');
+
+    let pageHeight = 
+      await session.executeScript(() => window.document.documentElement.clientHeight);
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert(Math.abs(pageYOffset - (1000 + Math.floor(pageHeight / 2))) < 5);
+  });
+
+  it('scrolls bottom by <C-B>', async () => {
+    await session.executeScript(() => window.scrollTo(0, 1000));
+    await body.sendKeys(Key.Control, 'b');
+
+    let pageHeight = 
+      await session.executeScript(() => window.document.documentElement.clientHeight);
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert(Math.abs(pageYOffset - (1000 - pageHeight)) < 5);
+  });
+
+  it('scrolls bottom by <C-F>', async () => {
+    await session.executeScript(() => window.scrollTo(0, 1000));
+    await body.sendKeys(Key.Control, 'f');
+
+    let pageHeight = 
+      await session.executeScript(() => window.document.documentElement.clientHeight);
+    let pageYOffset = await session.executeScript(() => window.pageYOffset);
+    assert(Math.abs(pageYOffset - (1000 + pageHeight)) < 5);
+  });
+});
diff --git a/e2e/tab.test.js b/e2e/tab.test.js
new file mode 100644
index 0000000..39338aa
--- /dev/null
+++ b/e2e/tab.test.js
@@ -0,0 +1,202 @@
+const express = require('express');
+const lanthan = require('lanthan');
+const path = require('path');
+const assert = require('assert');
+const eventually = require('./eventually');
+
+const Key = lanthan.Key;
+
+const newApp = () => {
+  let app = express();
+  app.get('/', (req, res) => {
+    res.send('ok');
+  });
+  return app;
+};
+
+describe("tab test", () => {
+
+  const port = 12321;
+  const url = `http://127.0.0.1:${port}/`;
+
+  let http;
+  let firefox;
+  let session;
+  let browser;
+  let win;
+  let tabs;
+
+  before(async() => {
+    firefox = await lanthan.firefox();
+    await firefox.session.installAddon(path.join(__dirname, '..'));
+    session = firefox.session;
+    browser = firefox.browser;
+    http = newApp().listen(port);
+  });
+
+  after(async() => {
+    http.close();
+    if (firefox) {
+      await firefox.close();
+    }
+  });
+
+  beforeEach(async() => {
+    win = await browser.windows.create({ url: `${url}#0` });
+    for (let i = 1; i < 5; ++i) {
+      await browser.tabs.create({ url: `${url}#${i}`, windowId: win.id });
+      await session.navigateTo(`${url}#${i}`);
+    }
+    tabs = await browser.tabs.query({ windowId: win.id });
+    tabs.sort((t1, t2) => t1.index - t2.index);
+  });
+
+  afterEach(async() => {
+    await browser.windows.remove(win.id);
+  });
+
+  it('deletes tab by d', async () => {
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('d');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current.length === tabs.length - 1);
+  });
+
+  it('deletes tabs to the right by D', async () => {
+    await browser.tabs.update(tabs[1].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'd');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current.length === 2);
+  });
+
+  it('duplicates tab by zd', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('z', 'd');
+
+    await eventually(async() => {
+      let current = await browser.tabs.query({ windowId: win.id });
+      current.sort((t1, t2) => t1.index - t2.index);
+      assert(current.length === tabs.length + 1);
+      assert(current[0].url === current[1].url);
+    });
+  });
+
+  it('makes pinned by zp', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('z', 'p');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[0].pinned);
+  });
+
+  it('selects previous tab by K', async () => {
+    await browser.tabs.update(tabs[2].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'K');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[1].active);
+  });
+
+  it('selects previous tab by K rotatory', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'K');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[current.length - 1].active)
+  });
+
+  it('selects next tab by J', async () => {
+    await browser.tabs.update(tabs[2].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'J');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[3].active);
+  });
+
+  it('selects previous tab by J rotatory', async () => {
+    await browser.tabs.update(tabs[tabs.length - 1].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Shift, 'J');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[0].active)
+  });
+
+  it('selects first tab by g0', async () => {
+    await browser.tabs.update(tabs[2].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('g', '0');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[0].active)
+  });
+
+  it('selects last tab by g$', async () => {
+    await browser.tabs.update(tabs[2].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('g', '$');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[current.length - 1].active)
+  });
+
+  it('selects last selected tab by <C-6>', async () => {
+    await browser.tabs.update(tabs[1].id, { active: true });
+    await browser.tabs.update(tabs[4].id, { active: true });
+
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys(Key.Control, '6');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current[1].active)
+  });
+
+  // browser.sessions.getRecentlyClosed() sometime throws "An unexpected error occurred"
+  // This might be a bug in Firefox.
+  it.skip('reopen tab by u', async () => {
+    await browser.tabs.remove(tabs[1].id);
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('u');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current.length === tabs.length);
+  });
+
+  it('does not delete pinned tab by d', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true, pinned: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('d');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current.length === tabs.length);
+  });
+
+  it('deletes pinned tab by !d', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true, pinned: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('!', 'd');
+
+    let current = await browser.tabs.query({ windowId: win.id });
+    assert(current.length === tabs.length - 1);
+  });
+
+  it('opens view-source by gf', async () => {
+    await browser.tabs.update(tabs[0].id, { active: true });
+    let body = await session.findElementByCSS('body');
+    await body.sendKeys('g', 'f');
+
+    await eventually(async() => {
+      let current = await browser.tabs.query({ windowId: win.id });
+      assert(current.length === tabs.length + 1);
+      assert(current[current.length - 1].url === `view-source:${url}#0`);
+    });
+  });
+});
diff --git a/e2e/web-server/index.js b/e2e/web-server/index.js
deleted file mode 100644
index 376e118..0000000
--- a/e2e/web-server/index.js
+++ /dev/null
@@ -1,88 +0,0 @@
-'use strict';
-
-var serverUrl = require('./url');
-var http = require('http');
-var url = require('url');
-
-const handleScroll = (req, res) => {
-  res.writeHead(200, {'Content-Type': 'text/html'});
-  res.end('<!DOCTYPEhtml><html lang="en"><body style="width:10000px; height:10000px"></body></html">');
-};
-
-const handleAPagenation = (req, res) => {
-  let u = url.parse(req.url);
-  let params = new url.URLSearchParams(u.search);
-  let page = params.get('page') === null ? null : Number(params.get('page'));
-  if (page === null || isNaN(page)) {
-    return handle404(req, res);
-  }
-
-  let body = '';
-  let nextLink = u.pathname + '?page=' + (page + 1);
-  let prevLink = u.pathname + '?page=' + (page - 1);
-
-  if (page > 1) {
-    body += '<a href="' + prevLink + '">prev</a> | ';
-  }
-  body += '<a href="' + nextLink + '">next</a>';
-
-  res.writeHead(200, {'Content-Type': 'text/html'});
-  res.end('<!DOCTYPEhtml><html lang="en"><body">' + body + '</body></html">');
-};
-
-const handleLinkPagenation = (req, res) => {
-  let u = url.parse(req.url);
-  let params = new url.URLSearchParams(u.search);
-  let page = params.get('page') === null ? null : Number(params.get('page'));
-  if (page === null || isNaN(page)) {
-    return handle404(req, res);
-  }
-
-  let head = '';
-  let nextLink = u.pathname + '?page=' + (page + 1);
-  let prevLink = u.pathname + '?page=' + (page - 1);
-
-  if (page > 1) {
-    head += '<link rel="prev" href="' + prevLink + '"></link>';
-  }
-  head += '<link rel="next" href="' + nextLink + '"></link>';
-
-  res.writeHead(200, {'Content-Type': 'text/html'});
-  res.end('<!DOCTYPEhtml><html lang="en"><head>' + head + '</head><body"></body></html">');
-};
-
-const handleFollow = (req, res) => {
-  let body = '';
-  body += '<a href="#a">a</a>';
-  body += '<a href="#external" target="_blank">external</a>';
-  body += '<img width="320" height="240"  src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=" usemap="#map"><map name="map"><area href="#area" shape="rect" coords="15,19,126,104"></map>'
-
-  res.writeHead(200, {'Content-Type': 'text/html'});
-  res.end('<!DOCTYPEhtml><html lang="en"><body">' + body + '</body></html">');
-}
-
-const handle404 = (req, res) => {
-  res.writeHead(404, {'Content-Type': 'text/plain'});
-  res.end('not found')
-};
-
-http.createServer(function (req, res) {
-  if (req.method !== 'GET') {
-    handle404(req, res);
-  }
-
-  let u = url.parse(req.url);
-  if (u.pathname === '/scroll' || u.pathname === '/mark') {
-    handleScroll(req, res);
-  } else if (u.pathname === '/a-pagenation') {
-    handleAPagenation(req, res);
-  } else if (u.pathname === '/link-pagenation') {
-    handleLinkPagenation(req, res);
-  } else if (u.pathname === '/follow') {
-    handleFollow(req, res);
-  } else {
-    handle404(req, res);
-  }
-
-  console.log(`"${req.method} ${req.url}"`, res.statusCode)
-}).listen(serverUrl.PORT, serverUrl.HOST);
diff --git a/e2e/web-server/url.js b/e2e/web-server/url.js
deleted file mode 100644
index 37f3d84..0000000
--- a/e2e/web-server/url.js
+++ /dev/null
@@ -1,5 +0,0 @@
-module.exports = {
-  PORT: 11111,
-  HOST: '127.0.0.1',
-  CLIENT_URL: 'http://127.0.0.1:11111',
-}
diff --git a/e2e/zoom.test.js b/e2e/zoom.test.js
new file mode 100644
index 0000000..bc89628
--- /dev/null
+++ b/e2e/zoom.test.js
@@ -0,0 +1,81 @@
+const express = require('express');
+const lanthan = require('lanthan');
+const path = require('path');
+const assert = require('assert');
+const eventually = require('./eventually');
+
+const Key = lanthan.Key;
+
+const newApp = () => {
+  let app = express();
+  app.get('/', (req, res) => {
+    res.send(`<!DOCTYPEhtml>
+<html lang="en">
+</html">`);
+  });
+  return app;
+};
+
+describe("zoom test", () => {
+
+  const port = 12321;
+  let http;
+  let firefox;
+  let session;
+  let browser;
+  let tab;
+  let body;
+
+  before(async() => {
+    http = newApp().listen(port);
+
+    firefox = await lanthan.firefox();
+    await firefox.session.installAddon(path.join(__dirname, '..'));
+    session = firefox.session;
+    browser = firefox.browser;
+    tab = (await browser.tabs.query({}))[0]
+  });
+
+  after(async() => {
+    if (firefox) {
+      await firefox.close();
+    }
+    http.close();
+  });
+
+  beforeEach(async() => {
+    await session.navigateTo(`http://127.0.0.1:${port}`);
+    body = await session.findElementByCSS('body');
+  });
+
+  it('should zoom in by zi', async () => {
+    let before = await browser.tabs.getZoom(tab.id);
+    await body.sendKeys('z', 'i');
+
+    await eventually(async() => {
+      let actual = await browser.tabs.getZoom(tab.id);
+      assert(before < actual);
+    });
+  });
+
+  it('should zoom out by zo', async () => {
+    let before = await browser.tabs.getZoom(tab.id);
+    await body.sendKeys('z', 'o');
+
+    await eventually(async() => {
+      let actual = await browser.tabs.getZoom(tab.id);
+      assert(before > actual);
+    });
+  });
+
+  it('scrolls left by h', async () => {
+    await browser.tabs.setZoom(tab.id, 2);
+    await body.sendKeys('z', 'z');
+
+    await eventually(async() => {
+      let actual = await browser.tabs.getZoom(tab.id);
+      assert(actual === 1);
+    });
+  });
+});
+
diff --git a/package-lock.json b/package-lock.json
index fcf6641..c747cfe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -780,15 +780,7 @@
           "version": "7.1.3",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
           "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
-          "dev": true,
-          "requires": {
-            "fs.realpath": "^1.0.0",
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "^3.0.4",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
+          "dev": true
         },
         "globals": {
           "version": "11.11.0",
@@ -1182,6 +1174,12 @@
       "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
       "dev": true
     },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
+      "dev": true
+    },
     "array-from": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/array-from/-/array-from-2.1.1.tgz",
@@ -1348,9 +1346,9 @@
       "dev": true
     },
     "atob": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
-      "integrity": "sha1-ri1acpR38onWDdf5amMUoi3Wwio=",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
+      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true
     },
     "aws-sign2": {
@@ -2581,15 +2579,6 @@
         "static-extend": "^0.1.1"
       },
       "dependencies": {
-        "define-property": {
-          "version": "0.2.5",
-          "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
-          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
-          "dev": true,
-          "requires": {
-            "is-descriptor": "^0.1.0"
-          }
-        },
         "isobject": {
           "version": "3.0.1",
           "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
@@ -2871,6 +2860,12 @@
       "integrity": "sha1-wguW2MYXdIqvHBYCF2DNJ/y4y3U=",
       "dev": true
     },
+    "content-disposition": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
+      "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
+      "dev": true
+    },
     "content-type": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
@@ -2889,6 +2884,12 @@
       "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
       "dev": true
     },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
+      "dev": true
+    },
     "copy-concurrently": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/copy-concurrently/-/copy-concurrently-1.0.5.tgz",
@@ -3372,56 +3373,12 @@
       }
     },
     "define-property": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
-      "integrity": "sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==",
+      "version": "0.2.5",
+      "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
+      "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
       "dev": true,
       "requires": {
-        "is-descriptor": "^1.0.2",
-        "isobject": "^3.0.1"
-      },
-      "dependencies": {
-        "is-accessor-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
-          "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
-          "dev": true,
-          "requires": {
-            "kind-of": "^6.0.0"
-          }
-        },
-        "is-data-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
-          "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
-          "dev": true,
-          "requires": {
-            "kind-of": "^6.0.0"
-          }
-        },
-        "is-descriptor": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
-          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
-          "dev": true,
-          "requires": {
-            "is-accessor-descriptor": "^1.0.0",
-            "is-data-descriptor": "^1.0.0",
-            "kind-of": "^6.0.2"
-          }
-        },
-        "isobject": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
-          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
-          "dev": true
-        },
-        "kind-of": {
-          "version": "6.0.2",
-          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
-          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
-          "dev": true
-        }
+        "is-descriptor": "^0.1.0"
       }
     },
     "delayed-stream": {
@@ -3452,6 +3409,12 @@
         "minimalistic-assert": "^1.0.0"
       }
     },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
+      "dev": true
+    },
     "detect-file": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-1.0.0.tgz",
@@ -4845,6 +4808,12 @@
       "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
       "dev": true
     },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
+      "dev": true
+    },
     "event-emitter": {
       "version": "0.3.5",
       "resolved": "https://registry.npmjs.org/event-emitter/-/event-emitter-0.3.5.tgz",
@@ -4948,6 +4917,73 @@
         "homedir-polyfill": "^1.0.1"
       }
     },
+    "express": {
+      "version": "4.16.4",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.16.4.tgz",
+      "integrity": "sha512-j12Uuyb4FMrd/qQAm6uCHAkPtO8FDTRJZBDd5D2KOL2eLaz1yUNdUB/NOIyq0iU4q4cFarsUCrnFDPBcnksuOg==",
+      "dev": true,
+      "requires": {
+        "accepts": "~1.3.5",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.18.3",
+        "content-disposition": "0.5.2",
+        "content-type": "~1.0.4",
+        "cookie": "0.3.1",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "1.1.1",
+        "fresh": "0.5.2",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.2",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.4",
+        "qs": "6.5.2",
+        "range-parser": "~1.2.0",
+        "safe-buffer": "5.1.2",
+        "send": "0.16.2",
+        "serve-static": "1.13.2",
+        "setprototypeof": "1.1.0",
+        "statuses": "~1.4.0",
+        "type-is": "~1.6.16",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      },
+      "dependencies": {
+        "finalhandler": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.1.tgz",
+          "integrity": "sha512-Y1GUDo39ez4aHAw7MysnUD5JzYX+WaIj8I57kO3aEPT1fFRL4sr7mjei97FgnwhAyyzRYmQZaTHb2+9uZ1dPtg==",
+          "dev": true,
+          "requires": {
+            "debug": "2.6.9",
+            "encodeurl": "~1.0.2",
+            "escape-html": "~1.0.3",
+            "on-finished": "~2.3.0",
+            "parseurl": "~1.3.2",
+            "statuses": "~1.4.0",
+            "unpipe": "~1.0.0"
+          }
+        },
+        "path-to-regexp": {
+          "version": "0.1.7",
+          "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
+          "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=",
+          "dev": true
+        },
+        "statuses": {
+          "version": "1.4.0",
+          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
+          "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
+          "dev": true
+        }
+      }
+    },
     "extend": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.1.tgz",
@@ -4955,24 +4991,12 @@
       "dev": true
     },
     "extend-shallow": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
-      "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+      "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
       "dev": true,
       "requires": {
-        "assign-symbols": "^1.0.0",
-        "is-extendable": "^1.0.1"
-      },
-      "dependencies": {
-        "is-extendable": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
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+              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -15769,6 +16016,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -15812,12 +16060,14 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "yallist": {
               "version": "3.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             }
           }
         },
@@ -16172,6 +16422,16 @@
             }
           }
         },
+        "define-property": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
+          "integrity": "sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==",
+          "dev": true,
+          "requires": {
+            "is-descriptor": "^1.0.2",
+            "isobject": "^3.0.1"
+          }
+        },
         "eslint-scope": {
           "version": "4.0.2",
           "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.2.tgz",
@@ -16274,6 +16534,27 @@
             }
           }
         },
+        "extend-shallow": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
+          "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+          "dev": true,
+          "requires": {
+            "assign-symbols": "^1.0.0",
+            "is-extendable": "^1.0.1"
+          },
+          "dependencies": {
+            "is-extendable": {
+              "version": "1.0.1",
+              "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+              "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
+              "dev": true,
+              "requires": {
+                "is-plain-object": "^2.0.4"
+              }
+            }
+          }
+        },
         "extglob": {
           "version": "2.0.4",
           "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
@@ -17036,8 +17317,7 @@
         "ansi-regex": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
         },
         "camelcase": {
           "version": "5.2.0",
@@ -17060,14 +17340,7 @@
           "version": "6.0.5",
           "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
           "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
-          "dev": true,
-          "requires": {
-            "nice-try": "^1.0.4",
-            "path-key": "^2.0.1",
-            "semver": "^5.5.0",
-            "shebang-command": "^1.2.0",
-            "which": "^1.2.9"
-          }
+          "dev": true
         },
         "execa": {
           "version": "1.0.0",
@@ -17172,20 +17445,13 @@
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
           "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
-          "dev": true,
-          "requires": {
-            "end-of-stream": "^1.1.0",
-            "once": "^1.3.1"
-          }
+          "dev": true
         },
         "strip-ansi": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^3.0.0"
-          }
+          "dev": true
         },
         "which-module": {
           "version": "2.0.0",
diff --git a/package.json b/package.json
index b8a2250..861cb9a 100644
--- a/package.json
+++ b/package.json
@@ -5,11 +5,9 @@
     "start": "webpack --mode development -w --debug --devtool inline-source-map",
     "build": "NODE_ENV=production webpack --mode production --progress --display-error-details",
     "package": "npm run build && script/package.sh",
-    "lint": "eslint --ext .jsx,.js src e2e/ambassador/src",
+    "lint": "eslint --ext .jsx,.js src",
     "test": "karma start",
-    "test:e2e": "karma start e2e/karma.conf.js",
-    "ambassador:start": "webpack --mode production -w --debug --context e2e/ambassador --config e2e/ambassador/webpack.config.js --devtool inline-source-map",
-    "ambassador:build": "webpack --mode production --context e2e/ambassador --config e2e/ambassador/webpack.config.js"
+    "test:e2e": "mocha --timeout 5000 e2e"
   },
   "repository": {
     "type": "git",
@@ -40,6 +38,7 @@
     "karma-sinon": "^1.0.5",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^3.0.5",
+    "lanthan": "git+https://github.com/ueokande/lanthan.git#master",
     "mocha": "^6.0.2",
     "node-sass": "^4.11.0",
     "preact": "^8.4.2",