Examine source code of 3D Print Cost Calculator

{
  "manifest_version": 3,
  "name": "3D Print Cost Calculator",
  "version": "1.0.2",
  "description": "Calculate 3D printing costs - material, electricity, amortization. Fully configurable for home use, friends, or selling.",
  "author": "BeYor",
  "homepage_url": "https://beyor.dev",
  "icons": {
    "16": "icons/icon.png",
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "action": {
    "default_title": "3D Print Cost Calculator",
    "default_icon": {
      "16": "icons/icon.png",
      "32": "icons/icon.png",
      "48": "icons/icon.png",
      "128": "icons/icon.png"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "3d-print-calculator@beyor",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}