diff --git a/src/actions/operation.js b/src/actions/operation.js
index 8b1590b..a27cd02 100644
--- a/src/actions/operation.js
+++ b/src/actions/operation.js
@@ -1,18 +1,9 @@
 import operations from 'shared/operations';
 import messages from 'shared/messages';
-import * as tabs from 'background/tabs';
-import * as zooms from 'background/zooms';
 import * as scrolls from 'content/scrolls';
 import * as navigates from 'content/navigates';
 import * as followActions from 'actions/follow';
 
-const sendConsoleShowCommand = (tab, command) => {
-  return browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_SHOW_COMMAND,
-    command,
-  });
-};
-
 const exec = (operation) => {
   switch (operation.type) {
   case operations.SCROLL_LINES:
@@ -49,43 +40,4 @@ const exec = (operation) => {
   }
 };
 
-const execBackground = (operation, tab) => {
-  switch (operation.type) {
-  case operations.TAB_CLOSE:
-    return tabs.closeTab(tab.id);
-  case operations.TAB_REOPEN:
-    return tabs.reopenTab();
-  case operations.TAB_PREV:
-    return tabs.selectPrevTab(tab.index, operation.count);
-  case operations.TAB_NEXT:
-    return tabs.selectNextTab(tab.index, operation.count);
-  case operations.TAB_RELOAD:
-    return tabs.reload(tab, operation.cache);
-  case operations.ZOOM_IN:
-    return zooms.zoomIn();
-  case operations.ZOOM_OUT:
-    return zooms.zoomOut();
-  case operations.ZOOM_NEUTRAL:
-    return zooms.neutral();
-  case operations.COMMAND_SHOW:
-    return sendConsoleShowCommand(tab, '');
-  case operations.COMMAND_SHOW_OPEN:
-    if (operation.alter) {
-      // alter url
-      return sendConsoleShowCommand(tab, 'open ' + tab.url);
-    }
-    return sendConsoleShowCommand(tab, 'open ');
-  case operations.COMMAND_SHOW_TABOPEN:
-    if (operation.alter) {
-      // alter url
-      return sendConsoleShowCommand(tab, 'tabopen ' + tab.url);
-    }
-    return sendConsoleShowCommand(tab, 'tabopen ');
-  case operations.COMMAND_SHOW_BUFFER:
-    return sendConsoleShowCommand(tab, 'buffer ');
-  default:
-    return Promise.resolve();
-  }
-};
-
-export { exec, execBackground };
+export { exec };
diff --git a/src/background/actions/index.js b/src/background/actions/index.js
new file mode 100644
index 0000000..e69de29
diff --git a/src/background/actions/operation.js b/src/background/actions/operation.js
new file mode 100644
index 0000000..d736c09
--- /dev/null
+++ b/src/background/actions/operation.js
@@ -0,0 +1,52 @@
+import operations from 'shared/operations';
+import messages from 'shared/messages';
+import * as tabs from 'background/tabs';
+import * as zooms from 'background/zooms';
+
+const sendConsoleShowCommand = (tab, command) => {
+  return browser.tabs.sendMessage(tab.id, {
+    type: messages.CONSOLE_SHOW_COMMAND,
+    command,
+  });
+};
+
+const exec = (operation, tab) => {
+  switch (operation.type) {
+  case operations.TAB_CLOSE:
+    return tabs.closeTab(tab.id);
+  case operations.TAB_REOPEN:
+    return tabs.reopenTab();
+  case operations.TAB_PREV:
+    return tabs.selectPrevTab(tab.index, operation.count);
+  case operations.TAB_NEXT:
+    return tabs.selectNextTab(tab.index, operation.count);
+  case operations.TAB_RELOAD:
+    return tabs.reload(tab, operation.cache);
+  case operations.ZOOM_IN:
+    return zooms.zoomIn();
+  case operations.ZOOM_OUT:
+    return zooms.zoomOut();
+  case operations.ZOOM_NEUTRAL:
+    return zooms.neutral();
+  case operations.COMMAND_SHOW:
+    return sendConsoleShowCommand(tab, '');
+  case operations.COMMAND_SHOW_OPEN:
+    if (operation.alter) {
+      // alter url
+      return sendConsoleShowCommand(tab, 'open ' + tab.url);
+    }
+    return sendConsoleShowCommand(tab, 'open ');
+  case operations.COMMAND_SHOW_TABOPEN:
+    if (operation.alter) {
+      // alter url
+      return sendConsoleShowCommand(tab, 'tabopen ' + tab.url);
+    }
+    return sendConsoleShowCommand(tab, 'tabopen ');
+  case operations.COMMAND_SHOW_BUFFER:
+    return sendConsoleShowCommand(tab, 'buffer ');
+  default:
+    return Promise.resolve();
+  }
+};
+
+export { exec };
diff --git a/src/actions/tab.js b/src/background/actions/tab.js
similarity index 100%
rename from src/actions/tab.js
rename to src/background/actions/tab.js
diff --git a/src/components/background.js b/src/background/components/background.js
similarity index 88%
rename from src/components/background.js
rename to src/background/components/background.js
index 200fedf..bfe1b3f 100644
--- a/src/components/background.js
+++ b/src/background/components/background.js
@@ -1,7 +1,7 @@
 import messages from 'shared/messages';
-import * as operationActions from 'actions/operation';
+import * as operationActions from 'background/actions/operation';
 import * as settingsActions from 'settings/actions/setting';
-import * as tabActions from 'actions/tab';
+import * as tabActions from 'background/actions/tab';
 import * as commands from 'shared/commands';
 
 export default class BackgroundComponent {
@@ -23,7 +23,7 @@ export default class BackgroundComponent {
 
   update() {
     let state = this.store.getState();
-    this.updateSettings(state.setting);
+    this.updateSettings(state);
   }
 
   updateSettings(setting) {
@@ -37,7 +37,7 @@ export default class BackgroundComponent {
     switch (message.type) {
     case messages.BACKGROUND_OPERATION:
       return this.store.dispatch(
-        operationActions.execBackground(message.operation, sender.tab),
+        operationActions.exec(message.operation, sender.tab),
         sender);
     case messages.OPEN_URL:
       if (message.newTab) {
@@ -58,7 +58,7 @@ export default class BackgroundComponent {
         });
       });
     case messages.SETTINGS_QUERY:
-      return Promise.resolve(this.store.getState().setting.settings);
+      return Promise.resolve(this.store.getState().settings);
     case messages.CONSOLE_QUERY_COMPLETIONS:
       return commands.complete(message.text, this.settings);
     case messages.SETTINGS_RELOAD:
diff --git a/src/background/index.js b/src/background/index.js
index c51754b..587cc0b 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -1,7 +1,7 @@
 import * as settingsActions from 'settings/actions/setting';
 import messages from 'shared/messages';
-import BackgroundComponent from 'components/background';
-import reducers from 'reducers';
+import BackgroundComponent from 'background/components/background';
+import reducers from 'settings/reducers/setting';
 import { createStore } from 'store';
 
 const store = createStore(reducers, (e, sender) => {
diff --git a/test/settings/reducers/setting.test.js b/test/settings/reducers/setting.test.js
new file mode 100644
index 0000000..0e84247
--- /dev/null
+++ b/test/settings/reducers/setting.test.js
@@ -0,0 +1,22 @@
+import { expect } from "chai";
+import actions from 'settings/actions';
+import settingReducer from 'settings/reducers/setting';
+
+describe("setting reducer", () => {
+  it('return the initial state', () => {
+    let state = settingReducer(undefined, {});
+    expect(state).to.have.deep.property('settings', {});
+  });
+
+  it('return next state for SETTING_SET_SETTINGS', () => {
+    let action = {
+      type: actions.SETTING_SET_SETTINGS,
+      settings: { value1: 'hello', value2: 'world' },
+    };
+    let state = settingReducer(undefined, action);
+    expect(state).to.have.deep.property('settings', {
+      value1: 'hello',
+      value2: 'world',
+    });
+  });
+});