Examine source code of Focus Glance Panel

{
  "manifest_version": 2,
  "name": "Focus Glance Panel",
  "version": "1.0.0",
  "description": "A tiny panel that shows a calm focus reminder.",
  "browser_action": {
    "default_title": "Focus Glance",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "fe9b4a74-fe34-4df4-ab3a-ebf8de69f3bb@focusglance.local",
      "strict_min_version": "58.0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "796ff5c0-73a7-4f14-93f6-6457a3929a63@focusglance.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}