Examine source code of Built-in proxy toggle

{
  "manifest_version": 3,
  "name": "ProxySwitcher",
  "version": "1.0.0",
  "description": "One-click switch for Firefox proxy mode",
  "default_locale": "en",
  "permissions": [
    "proxy"
  ],
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "proxyswitcher@tianbin.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background/proxy-handler.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "ProxySwitcher",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}