Excellent! Rated 5 out of 5 stars

This is a great add-on. There are a couple of things I'd like to see added such as show text-shadow, copy as computed CSS rule, keyboard short-cut. Also the ability to keep inspecting fonts until deactivate. Usually I like to see what's used for the body text, heading text, and others in one session. Actually, best thing would be to see some sort of a report of what's used on the page, but that's a lot to ask.

This review is for a previous version of the add-on (1.0.1-signed).