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What does a number on the Firefox taskbar icon mean?

Today, I suddenly noticed a "24" within a circle (or on a circle) on the Firefox taskbar icon. Does anyone know what that is? I don't ever remember seeing that before. I maintain hundreds of PCs and am seeing it on my own production system for the first time anywhere.

I've uploaded two images of it.

Thanks, Carl

Today, I suddenly noticed a "24" within a circle (or on a circle) on the Firefox taskbar icon. Does anyone know what that is? I don't ever remember seeing that before. I maintain hundreds of PCs and am seeing it on my own production system for the first time anywhere. I've uploaded two images of it. Thanks, Carl
Attached screenshots

All Replies (1)

Hi Carl, I haven't seen that, but I have all the windows combined into one Taskbar button so if there are new developments/notifications for any particular tab, I wouldn't expect to see that.

Oh, could it be added by Windows, based on unviewed notifications is in the action/notification center? https://support.microsoft.com/en-us/windows/find-your-notifications-and-quick-settings-actions-cccdb22c-bda9-5ad5-897d-897ac67f7e39