Examine source code of Proxy-Fu

{
  "manifest_version": 3,
  "name": "Proxy-Fu",
  "version": "1.3",
  "description": "Dynamic HTTP/SOCKS proxy addon that tries not to suck. Routes traffic through proxies based on hostnames.",
  "permissions": [
    "proxy",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Proxy is on",
    "default_icon": {
      "16": "icons/proxy-off.png",
      "32": "icons/proxy-off.png"
    }
  },
  "icons": {
    "48": "icons/proxy-off.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "background.js",
        "options.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "v3g4s503-proxyfu@gmail.com",
      "strict_min_version": "91.1.0"
    }
  }
}