From March 27th, 2013 to August 6th, 2018, 50% user give 3-star rating, 50% user give 1-star rating. for Tab Badges chrome extension.
Does not work.
Does not work on pinned tabs. Also, as already stated ctrl/alt does not work. A good start. Wouls like to see red circles (like most other badges) that appear in open tabs and pinned tabs. Keep up the good work and I'll update my rating.