Tab update events should only fire when data has changed

lib/browser/api/extensions.js

@@ -2,6 +2,7 @@ const {app, BrowserWindow, ipcMain, webContents, session} = require('electron')
 const path = require('path')
 const browserActions = require('./browser-actions')
 const assert = require('assert')
+const deepEqual = require('../../common/deep-equal')
 
 // List of currently active background pages by extensionId
 var backgroundPages = {}
@@ -288,7 +289,7 @@ const chromeTabsUpdated = function (tabId) {
   let changeInfo = {}
 
   for (var key in tabValue) {
-    if (tabValue[key] !== oldTabInfo[key]) {
+    if (!deepEqual(tabValue[key], oldTabInfo[key])) {
       changeInfo[key] = tabValue[key]
     }
   }

lib/common/deep-equal.js

@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const deepEqual = (x, y) => {
+  if (typeof x !== typeof y) {
+    return false
+  }
+  if (typeof x !== 'object') {
+    return x === y
+  }
+  const xKeys = Object.keys(x)
+  const yKeys = Object.keys(y)
+  if (xKeys.length !== yKeys.length) {
+    return false
+  }
+  for (let prop in x) {
+    if (x.hasOwnProperty(prop)) {
+      if (!deepEqual(x[prop], y[prop])) {
+        return false
+      }
+    }
+  }
+  return true
+}
+
+module.exports = deepEqual