Examine source code of URL Shortcut Expander

{
  "manifest_version": 2,
  "name": "URL Shortcut Expander",
  "version": "1.0",
  "description": "Expands shortened URLs (bit.ly, tinyurl) to reveal their full links.",
  "permissions": [
    "contextMenus",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c89b0839-a2ff-43f6-86fa-0f4024d1ef4c}"
    }
  }
}