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

Type

Values of this type are strings. Possible values are:

"install"
The extension was installed.
"update"
The extension was updated to a new version.
"browser_update"
The browser was updated to a new version.
"shared_module_update"
Another extension, which contains a module used by this extension, was updated.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
OnInstalledReasonChrome Full support Yes
Notes
Full support Yes
Notes
Notes Uses 'chrome_update' instead of 'browser_update'.
Edge Full support 14
Notes
Full support 14
Notes
Notes Only supports 'install' and 'update'.
Firefox Full support 45Opera Full support Yes
Notes
Full support Yes
Notes
Notes Uses 'chrome_update' instead of 'browser_update'.
Firefox Android Full support 48

Legend

Full support  
Full support
See implementation notes.
See implementation notes.
Acknowledgements

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.

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