Old Gmail chat

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Old Gmail chat",
  "version": "0.5.2",
  "description": "Make Hangouts look more like old Gmail chat.",
  "icons": {
    "128": "cubist-hangouts-logo.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "matches": [
        "https://mail.google.com/*",
        "https://hangouts.google.com/*",
        "https://*.hangouts.sandbox.google.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "eventPage.js"
    ],
    "persistent": false
  },
  "permissions": [
    "https://mail.google.com/*",
    "https://hangouts.google.com/*",
    "https://*.hangouts.sandbox.google.com/*",
    "notifications",
    "https://*.googleusercontent.com/*"
  ],
  "manifest_version": 2
}