For a few days now, as you can see in the screenshot, Gmail is notifying me of new messages in the "Notifications" tab even though there are no new messages there.
Update your browser as indicated in the blue banner; it might fix the problem!
BourrinOman83
Author
But when I go on Firefox, it says that it is up to date
brucine
Hello,
It’s either the Mac OS version that is too old, or a browser extension (including ad blockers or script blockers). Start by trying to test without them.