An add-on I didn't know I needed; now can't do without! Rated 5 out of 5 stars

I don't remember how I came across this lovely little add-on, but I am very grateful I did. It has suddenly jumped from "an add-on awash in the thousands I didn't know existed" to my "must-have" collection.
I rated it 4/5 only because I'd love to see it replace the text counter in the tab bar rather than adding a second counter, and I'd love to see it work with more sites.
Meh, heck with it, changing it to 5/5. This unexpected little gem is brilliant, light-weight, and wonderful.

This review is for a previous version of the add-on (1.8.1-signed).