Examine source code of Title Changer

{
  "manifest_version": 2,
  "name": "Title Changer",
  "version": "0.6",
  "description": "Change the title of the page you're in!",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "titlechanger.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{179ecad6-378d-4f0c-aa06-53d6318f075d}"
    }
  }
}