Examine source code of proxy quick switcher

{
  "manifest_version": 2,
  "name": "Proxy Switcher",
  "version": "1.0",
  "description": "快速切换Firefox代理设置",
  "browser_specific_settings": {
    "gecko": {
      "id": "2309900@qq.com",
      "strict_min_version": "91.1.0"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "proxy",
    "storage",
    "privacy",
    "browserSettings"
  ],
  "incognito": "spanning",
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48-grey.svg",
      "96": "icons/icon-48-grey.svg"
    },
    "default_title": "Proxy Switcher",
    "default_popup": "popup/proxy-switcher.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  }
}