index.md

---

title: runtime.OnRestartRequiredReason
slug: Mozilla/Add-ons/WebExtensions/API/runtime/OnRestartRequiredReason
page-type: webextension-api-type
tags:
  - API
  - Add-ons
  - Extensions
  - Non-standard
  - OnRestartRequiredReason
  - Reference
  - Type
  - WebExtensions
  - runtime
browser-compat: webextensions.api.runtime.OnRestartRequiredReason

---

{{AddonSidebar()}}

The reason that the {{WebExtAPIRef("runtime.onRestartRequired", "onRestartRequired")}} event is being dispatched.

Type

Values of this type are strings. Possible values are:

• "app_update": The application is being updated to a newer version.

• "os_update": The browser/OS is updated to a newer version.

• "periodic": The system has run for more than the permitted uptime set in the enterprise policy.

Browser compatibility

{{Compat}}

{{WebExtExamples}}

Note: This API is based on Chromium's chrome.runtime API. This documentation is derived from runtime.json in the Chromium code.