|User since||Jan. 8, 2016|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Rated 4 out of 5 stars
Worked great, but doesn't support e10s. If the author won't update the addon, you can use "Tab Count" by plujon. It shows a "badge" instead of plain number, but works fine.