Examine source code of VUI.LA

{
  "name": "VUI.LA",
  "version": "1.0.1resigned1",
  "description": "Shorten URL",
  "permissions": [
    "activeTab",
    "cookies",
    "https://vui.la/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "img/16.png",
      "32": "img/32.png",
      "48": "img/48.png",
      "128": "img/128.png"
    }
  },
  "icons": {
    "16": "img/16.png",
    "32": "img/32.png",
    "48": "img/48.png",
    "128": "img/128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{e1c3bf50-a680-4265-8a7a-dc29d308fb6a}"
    }
  }
}