The reason that the runtime.onInstalled event is being dispatched.


Values of this type are strings. Possible values are:


The extension was installed.


The extension was updated to a new version.

"browser_update" or, for Chrome, "chrome_update"

The browser was updated to a new version.


Another extension, which contains a module used by this extension, was updated.

Browser compatibility

BCD tables only load in the browser

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

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.