Examine source code of Bookmark Time Manager

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "bookmarks",
    "storage",
    "notifications"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8d5b0a1-0f2c-8d0e-1c0f-3b6f01dfb1ac}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_data": false
      }
    }
  }
}