Examine source code of Metric Unit Conversion Calculator

{
  "manifest_version": 3,
  "version": "1.3",
  "name": "Metric Unit Conversion Calculator",
  "description": "Convert metric and imperial units instantly across 10 categories: length, area, volume, mass, speed, time, temperature, pressure, energy, and data",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png"
  },
  "action": {
    "default_title": "Metric Unit Conversion Calculator",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "search",
    "cookies",
    "alarms",
    "webRequest",
    "tabs"
  ],
  "host_permissions": [
    "https://*.metricunitconverter.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://metricunitconverter.com/*",
        "*://*.metricunitconverter.com/*"
      ],
      "run_at": "document_end",
      "all_frames": false,
      "js": [
        "js/contentscript.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Metric Unit Conversion Calculator",
      "keyword": "units",
      "search_url": "https://search.metricunitconverter.com/search?q={searchTerms}",
      "favicon_url": "favicon.ico",
      "is_default": true
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9cea876-e3a0-4ce1-9320-4855d0cc408e}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}