Examine source code of PX to REM Converter

{
  "manifest_version": 3,
  "name": "PX to REM Converter",
  "short_name": "PX to REM",
  "version": "1.0.0",
  "description": "Instantly convert pixel values to REM with a custom base font size. Fast, clean, and built for developers. No ads, no tracking.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "PX to REM Converter",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "px-to-rem@remtopxonline.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}