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
"chrome_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
Acknowledgements
This API is based on Chromium's chrome.runtime API. This documentation is derived from runtime.json in the Chromium code.
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