Our team uses Google Chat on Gmail. It would be good if you supported it.
(google chat notif on Checker Plus for Gmail)

https://support.google.com/chat/answer/9341104?hl=en&co=GENIE.Platform%3DAndroid

Being able to see my new emails at a glance without having to leave the current webpage I'm on in a huge game changer. Can't live without this now, thank you add-on dev!

Perfect mail notification extension, does exactly what is promised certainly when you contribute an amount you will have this fixed on most browsers.