Examine source code of Block Redirect

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.3",
  "description": "__MSG_extDescription__",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "64": "icon.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "__MSG_actionTitle__",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "stopper.js"
      ],
      "run_at": "document_start"
    }
  ],
  "applications": {
    "gecko": {
      "id": "{1766eb25-d49a-4f96-b94f-81f2d033fd78}",
      "strict_min_version": "90.0"
    }
  },
  "default_locale": "en"
}