Examine source code of Deck Extractor

{
  "manifest_version": 3,
  "name": "Deck Extractor",
  "version": "2.1",
  "description": "提取卡组",
  "permissions": [
    "scripting",
    "activeTab",
    "clipboardWrite"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "choowx2002@gmail.com"
    }
  }
}