Examine source code of WDownloader

{
  "manifest_version": 2,
  "name": "WDownloader",
  "version": "1.0",
  "description": "A extension that allow students to download documents from Wuolah's page.",
  "browser_specific_settings": {
    "gecko": {
      "id": "dark-bash@binbashproductions.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "cookies",
    "https://wuolah.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "96": "icon96.png"
    }
  },
  "icons": {
    "96": "icon96.png"
  }
}