Rated 5 out of 5 stars

Yes, this is what was needed :)

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v.1.9.2: Added format strings to advanced text formatting for visible (group) tabs and all tabs.
This allows tab counter to count both all tabs as well as tabs in the current visible group.
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It remains only to localize all format strings.

This review is for a previous version of the add-on (1.9.2.1-signed).  This user has a previous review of this add-on.