diff --git a/src/shared/settings/property-types.js b/src/shared/settings/property-types.js
new file mode 100644
index 0000000..bcfa809
--- /dev/null
+++ b/src/shared/settings/property-types.js
@@ -0,0 +1,6 @@
+export default {
+  // TODO describe property types here
+  // mystr: 'string',
+  // mynum: 'number',
+  // mybool: 'boolean',
+};
diff --git a/src/shared/settings/validator.js b/src/shared/settings/validator.js
index 949ab29..6fadac7 100644
--- a/src/shared/settings/validator.js
+++ b/src/shared/settings/validator.js
@@ -1,6 +1,7 @@
 import operations from 'shared/operations';
+import propertyTypes from './property-types';
 
-const VALID_TOP_KEYS = ['keymaps', 'search', 'blacklist'];
+const VALID_TOP_KEYS = ['keymaps', 'search', 'blacklist', 'properties'];
 const VALID_OPERATION_VALUES = Object.keys(operations).map((key) => {
   return operations[key];
 });
@@ -48,6 +49,17 @@ const validateSearch = (search) => {
   }
 };
 
+const validateProperties = (properties) => {
+  for (let name of Object.keys(properties)) {
+    if (!propertyTypes[name]) {
+      throw new Error(`Unknown property name: "${name}"`);
+    }
+    if (typeof properties[name] !== propertyTypes[name]) {
+      throw new Error(`Invalid type for property: "${name}"`);
+    }
+  }
+};
+
 const validate = (settings) => {
   validateInvalidTopKeys(settings);
   if (settings.keymaps) {
@@ -56,6 +68,9 @@ const validate = (settings) => {
   if (settings.search) {
     validateSearch(settings.search);
   }
+  if (settings.properties) {
+    validateProperties(settings.properties);
+  }
 };
 
 export { validate };
diff --git a/src/shared/settings/values.js b/src/shared/settings/values.js
index 4e55fa0..5027ba5 100644
--- a/src/shared/settings/values.js
+++ b/src/shared/settings/values.js
@@ -44,9 +44,12 @@ const valueFromForm = (form) => {
     }
   }
 
-  let blacklist = form.blacklist;
-
-  return { keymaps, search, blacklist };
+  return {
+    keymaps,
+    search,
+    blacklist: form.blacklist,
+    properties: form.properties
+  };
 };
 
 const jsonFromValue = (value) => {
@@ -78,9 +81,12 @@ const formFromValue = (value, allowedOps) => {
     }
   }
 
-  let blacklist = value.blacklist;
-
-  return { keymaps, search, blacklist };
+  return {
+    keymaps,
+    search,
+    blacklist: value.blacklist,
+    properties: value.properties,
+  };
 };
 
 const jsonFromForm = (form) => {
diff --git a/test/shared/settings/values.test.js b/test/shared/settings/values.test.js
index 2632cd7..62cfb5f 100644
--- a/test/shared/settings/values.test.js
+++ b/test/shared/settings/values.test.js
@@ -7,13 +7,21 @@ describe("settings values", () => {
       let json = `{
         "keymaps": { "0": {"type": "scroll.home"}},
         "search": { "default": "google", "engines": { "google": "https://google.com/search?q={}" }},
-        "blacklist": [ "*.slack.com"]
+        "blacklist": [ "*.slack.com"],
+        "properties": {
+          "mystr": "value",
+          "mynum": 123,
+          "mybool": true
+        }
       }`;
       let value = values.valueFromJson(json);
 
       expect(value.keymaps).to.deep.equal({ 0: {type: "scroll.home"}});
       expect(value.search).to.deep.equal({ default: "google", engines: { google: "https://google.com/search?q={}"} });
       expect(value.blacklist).to.deep.equal(["*.slack.com"]);
+      expect(value.properties).to.have.property('mystr', 'value');
+      expect(value.properties).to.have.property('mynum', 123);
+      expect(value.properties).to.have.property('mybool', true);
     });
   });
 
@@ -29,6 +37,11 @@ describe("settings values", () => {
           engines: [['google', 'https://google.com/search?q={}']],
         },
         blacklist: ['*.slack.com'],
+        "properties": {
+          "mystr": "value",
+          "mynum": 123,
+          "mybool": true,
+        }
       };
       let value = values.valueFromForm(form);
 
@@ -37,6 +50,9 @@ describe("settings values", () => {
       expect(JSON.stringify(value.search)).to.deep.equal(JSON.stringify({ default: "google", engines: { google: "https://google.com/search?q={}"} }));
       expect(value.search).to.deep.equal({ default: "google", engines: { google: "https://google.com/search?q={}"} });
       expect(value.blacklist).to.deep.equal(["*.slack.com"]);
+      expect(value.properties).to.have.property('mystr', 'value');
+      expect(value.properties).to.have.property('mynum', 123);
+      expect(value.properties).to.have.property('mybool', true);
     });
 
     it('convert from empty form', () => {
@@ -45,6 +61,7 @@ describe("settings values", () => {
       expect(value).to.not.have.key('keymaps');
       expect(value).to.not.have.key('search');
       expect(value).to.not.have.key('blacklist');
+      expect(value).to.not.have.key('properties');
     });
 
     it('override keymaps', () => {
@@ -96,7 +113,12 @@ describe("settings values", () => {
           0: { type: 'scroll.home' },
         },
         search: { default: 'google', engines: { google: 'https://google.com/search?q={}' }},
-        blacklist: [ '*.slack.com']
+        blacklist: [ '*.slack.com'],
+        properties: {
+          "mystr": "value",
+          "mynum": 123,
+          "mybool": true,
+        }
       };
       let allowed = ['scroll.vertically?{"count":1}', 'scroll.home' ];
       let form = values.formFromValue(value, allowed);
@@ -109,6 +131,9 @@ describe("settings values", () => {
       expect(form.search).to.have.deep.property('engines', [['google', 'https://google.com/search?q={}']]);
       expect(form.blacklist).to.have.lengthOf(1);
       expect(form.blacklist).to.include('*.slack.com');
+      expect(form.properties).to.have.property('mystr', 'value');
+      expect(form.properties).to.have.property('mynum', 123);
+      expect(form.properties).to.have.property('mybool', true);
     });
   });
 });