Examine source code of Site Time Limiter

{
  "manifest_version": 2,
  "name": "Site Time Limiter",
  "version": "0.3.2",
  "description": "Limits daily time spent on certain websites.",
  "browser_specific_settings": {
    "gecko": {
      "id": "site-limiter@vieitesss.eu",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Site Limiter",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "assets/icon-48.png",
      "96": "assets/icon-96.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}