Examine source code of 闲鱼助手

{
  "manifest_version": 3,
  "name": "闲鱼助手",
  "version": "1.0.2",
  "description": "PC端打开闲鱼或者转转的h5页面时，自动打开一个手机尺寸比例的窗口浏览",
  "homepage_url": "https://github.com/TheKonka/goofish-browser-extension",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cqzhou1996@gmail.com"
    }
  }
}