Examine source code of paskij Calculator

{
  "manifest_version": 3,
  "name": "Plus Calculator",
  "version": "1.0",
  "description": "A simple popup calculator that adds two numbers.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "Plus Calculator"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "plus.calculator@montraski.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collection_enabled": false
      }
    }
  }
}