Examine source code of Trailmark

{
  "manifest_version": 3,
  "name": "Trailmark",
  "version": "1.0.0",
  "description": "Save and restore exact scroll positions per page URL while you research.",
  "icons": {
    "48": "brand/icon-48.png",
    "96": "brand/icon-96.png",
    "128": "brand/icon-128.png"
  },
  "action": {
    "default_title": "Trailmark",
    "default_popup": "dock/panel.html",
    "default_icon": {
      "48": "brand/icon-48.png"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "scripting",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fa8c56b-d5ce-4f49-8265-69ce8c5d7a95}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}