manifest.json

{
  "manifest_version": 2,
  "name": "Hangouts Notifications",
  "description": "Add Chrome notifications to hangouts",
  "short_name": "Hangouts Notifications",
  "version": "3.1.1",
  "icons": {
    "18": "icons/18.png",
    "19": "icons/19.png",
    "38": "icons/38.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "18": "icons/inactive_18.png",
      "19": "icons/inactive_19.png",
      "38": "icons/inactive_38.png",
      "48": "icons/inactive_48.png",
      "128": "icons/inactive_128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://hangouts.google.com/webchat/*",
        "https://hangouts.google.com/webchat/u/*",

        "http://hangouts.google.com/webchat/*",
        "http://hangouts.google.com/webchat/u/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": ["configuration.js", "Notification.js", "optionalPermissions.js", "background.js"],
    "persistent": false
  },
  "options_page": "options/options.html",
  "permissions": ["storage", "notifications"],
  "optional_permissions": ["tabs"],
  "content_security_policy": "default-src 'self'; script-src 'self' 'unsafe-eval' https://www.google-analytics.com; img-src 'self' https://www.google-analytics.com https://stats.g.doubleclick.net data:"
}