Opsgenie Alert Notifier is an extension for showing latest alerts and getting notifications for new alert(s) via polling Opsgenie’s REST API's List Alert endpoint.

Configurations:
* Select Opsgenie region: US or EU
* Set API Key from your Opsgenie account which should have READ access
* Set Time Interval for polling Rest API, keep in mind your rates  
* Put down your Alert Query (About: https://docs.opsgenie.com/docs/alerts-search-query-help)

Extension Popup view:
* Check your latest alerts by clicking Opsgenie logo on browser's extensions section
* See count of alerts on icon's badge (max limit is 100)
* Check for error messages if any

Notifications:
* If you have new notifications after new request to REST API, you will get browser notification.
* If there is one, you can access that notification via clicking it.
* If more than one, you can see list of them (not supported for MacOS because of OS limitations)

CAUTION: For using this extension, you should have an active Opsgenie account

Source: https://github.com/cemkucuk/opsgenie-chrome-extension