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.