Examine source code of Week Calculator

{
  "manifest_version": 3,
  "name": "Week Calculator",
  "version": "3.0.1",
  "description": "Calculate week numbers and date ranges (Sunday start). Quick Check preview, improved year-boundary and calendar accuracy.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "Week Calculator"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "week-calculator@yourdomain.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}