Examine source code of TitleURL

{
  "manifest_version": 2,
  "name": "TitleURL",
  "version": "0.6resigned1",
  "description": "Add the current URL to the windows title bar",
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "defaultSettings.js",
        "titleUrlPage.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "defaultSettings.js",
      "titleurl.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcdb71fb-c9e5-48a3-9d04-e32713f5da88}"
    }
  }
}