Examine source code of Proxy Checker

{
  "name": "Bulk Proxy Checker",
  "description": "Checks the quality of proxies in bulk.",
  "version": "1.0.9",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "pcv1@pixelscan.net",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_title": "Proxy Checker",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "24": "icons/icon-24.png",
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Proxy Checker",
    "default_panel": "sidepanel.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "24": "icons/icon-24.png",
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "24": "icons/icon-24.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "nativeMessaging",
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "optional_permissions": [],
  "incognito": "spanning"
}