Examine source code of Google Link Cleaner

{
  "description": "Google Link Cleaner add-on.",
  "manifest_version": 2,
  "name": "Google Link Cleaner",
  "version": "1.4resigned1",
  "applications": {
    "gecko": {
      "id": "{d153bc49-6ada-41e0-9141-9f8d00373d93}"
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "notifications",
    "alarms",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}