Examine source code of Social Blur Limiter

{
  "manifest_version": 2,
  "name": "Social Blur Limiter",
  "version": "1.0",
  "description": "Làm mờ trang mạng xã hội nếu bạn dùng quá lâu.",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*",
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{acd9f52a-4b67-4233-8231-1a4a5c33a83b}"
    }
  }
}