The one tool I would go crazy to develop without. Rated 5 out of 5 stars

More important to me as a web developer than my IDE. Firefox and Chrome do a good job trying to emulate the functionality that Firebug has had for years, but they just fall short. I can't sell the importance of this add on to me enough. It's so vital to my development process I don't even know how to phrase it.

This review is for a previous version of the add-on (