Examine source code of Fontchi Font Changer

{
  "manifest_version": 2,
  "name": "Fontchi Font Changer",
  "version": "2.2.2",
  "description": "با فونتچی؛ وبگردی روزانه‌تان را متحول کنید. بیش از ۲۳ فونت متنوع برای استفاده در سایت‌های دلخواه با قابلیت تبدیل اعداد به فارسی و استفاده از فونت شخصی.",
  "homepage_url": "https://fontchi.com",
  "developer": {
    "name": "Fontchi",
    "url": "https://fontchi.com"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "config.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hi@fontchi.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "config.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "fonts/*.woff2"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Fontchi Settings",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}