Examine source code of Style Switcher

{
  "manifest_version": 2,
  "name": "Style Switcher",
  "version": "1.18",
  "description": "تغییر فونت و اندازه متون سایت‌ها",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "تنظیمات نمایش"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{61d10bd4-07fe-413c-9813-65b3ab853630}"
    }
  }
}