Examine source code of Bing--

{
  "manifest_version": 2,
  "name": "Bing--",
  "version": "1.2",
  "description": "Replace the Bing searchbox",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://cn.bing.com/search*",
        "https://www.bing.com/search*"
      ],
      "js": [
        "libs/jquery-3.7.1.min.js",
        "libs/quill.js",
        "search.js"
      ],
      "css": [
        "libs/quill.snow.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c69ec523-bef5-4c78-9b4e-28c522fe52fb}"
    }
  }
}