Examine source code of Duckier

{
  "manifest_version": 2,
  "name": "Duckier",
  "short_name": "Duckier",
  "version": "1.0.2",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "author": "Duckier Interactive - FZCO",
  "homepage_url": "https://duckier.com",
  "developer": {
    "name": "Duckier Interactive - FZCO",
    "url": "https://duckier.com"
  },
  "permissions": [
    "proxy",
    "storage",
    "alarms",
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "privacy",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "duckier-vpn@duckier.com",
      "strict_min_version": "91.1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file://*/*"
      ],
      "js": [
        "browser.js"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}