Examine source code of Shift Proxy Switcher

{
  "manifest_version": 3,
  "name": "Shift Proxy Switcher",
  "short_name": "Shift Proxy",
  "version": "1.1.1",
  "description": "Quickly configure and switch HTTP, HTTPS, SOCKS4 and SOCKS5 proxies from a clean toolbar popup.",
  "permissions": [
    "proxy",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Shift Proxy Switcher",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e88f2227-9d38-4d32-b01d-cbcb79864f61}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}