If all you want is to display the tab count, it will deliver. I had a little bit of a hard time making out the text on the badge but hovering over it, I could read the tooltip/pop-out text easily enough.

This addon does not have a Preferences section so if you were hoping to customize background/foreground colors or increase the font size, better look elsewhere. For those use-cases, you might try: 'Tab Count Icon by lllusion3418', 'Tab Counter (Tilwa fork) by tqdv', or 'Tab Counter (fork) by vhfmag'

This addon consumes enormous amounts of memory when you close multiple tabs.
When I decided to close a group of 40 tabs, this addon consumed extra 3 GB of memory, and this memory was freed only after a minute. If you attempt to close a group with more tabs, it can just consume all your available memory and crash the browser.

EXCELLENT

Thank You so much It does what it says !

Działa jak należy.

Please make the name of the extension 'Open Tab Count'.

It's a nice complement to Tab Tally,
https://addons.mozilla.org/addon/tab-tally/

I do have Status-4-Evar (mentioned by previous reviewers) but it's not necessary for version 3.1 of Open Tab Count.