No X-Notifier icon in Opera GX...

X-Notifier icon disappeared from the extensions panel in Opera GX today. It was there yesterday, it is still present in Google Chrome, but I don't see the icon (and, thus, can't access the menu and get to my e-mail) in Opera GX.
The extension is working, showing the notifications and opening new tabs with my mailboxes if I enable those features, but I can't use the exetension in the way I got used to use it. Can this be fixed, please?