Examine source code of MessageClip

{
  "manifest_version": 3,
  "name": "MessageClip",
  "version": "2.0",
  "description": "接收 WebSocket 服务器推送的消息,自动将消息复制到剪贴板并显示消息通知预览",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "notifications",
    "clipboardWrite",
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "messageclip@example.com"
    }
  }
}