For downloads and more information,
visit the Firebug homepage.
Very useful, mostly for web developers though. Its real-time editing capabilities can come at handy on websites relying on the browser as a trusted client.
Along with your rating, you can use the comment form to post a review,
tutorial, tips and tricks, or anything else others will find useful.
If you develop this software (or work for the company), please don't rate it. You may leave a clarifying comment as long as you state your affiliation and don't specify a star rating (just leave it as “No rating”).