Use it every day Rated 5 out of 5 stars

Great extension. I use it almost every day.

I run the #webdev channel on DALnet, and I can’t imagine diagnosing people’s HTML problems without Firebug.

There’s only one caveat: It slows Firefox down a bit. For example, it used to take 2.8 seconds for Firefox 3.0 to start up and load the default homepage – with Firebug, it takes 3.4 seconds.

This review is for a previous version of the add-on (1.2.0b3).