On a web browser tab what is represented by a greyed out Discourse icon with a number in it

What does the different icon represent in the browser tab on the right? It is a number 1 in a greyed out Discourse icon.


If I refresh the page the icon returns to normal:

I apologize in advance if I’ve missed something really obvious. :smiley:

New/updated topic count. Has default settings and per-user settings.

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I’ve just realized that I don’t use a desktop browser much. :roll_eyes: