Examine source code of DomainWatch

{
  "manifest_version": 3,
  "name": "DomainWatch",
  "version": "1.0.0",
  "description": "Track active browsing time by domain throughout the day.",
  "icons": {
    "48": "sigil/icon-48.png",
    "96": "sigil/icon-96.png",
    "128": "sigil/icon-128.png"
  },
  "action": {
    "default_title": "DomainWatch",
    "default_popup": "panel/overview.html",
    "default_icon": {
      "48": "sigil/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "engine/tracker.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1f66df1-a95d-4d1a-8ddf-5f64cb66f3be}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}