Examine source code of Calorie Calculator

{
  "name": "Calorie Calculator",
  "version": "0.0.0.1",
  "manifest_version": 3,
  "description": "A calorie calculator",
  "icons": {
    "16": "icons/add-4290511930.png",
    "32": "icons/Add-2442814916.png",
    "64": "icons/36-4092409201.png",
    "128": "icons/calories-icon-3327263925.png"
  },
  "action": {
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1212b026-d8b9-44d3-96ba-8f712e2a9104}",
      "strict_min_version": "42.0"
    }
  }
}