Still works when others don't Rated 3 out of 5 stars
The latest firefox release removed the addon bar and so the popular "tab-counter" (https://addons.mozilla.org/firefox/addon/tab-counter-141863/) and "TabCounter" (https://addons.mozilla.org/firefox/addon/tabcounter/) addons aren't working yet. This one still does. :-)
Note: It shows the *total* number of tabs you have open, not per-window.
@developer: Any way to remove that annoying right-side margin? It would be a perfect lightweight addon otherwise.