Add-on installed in the newest (always) Firefox Dev Edition. But when I click CSS > Edit CSS, I get this wonderful message:
Web Developer does not work on Chrome Extension Gallery of Firefox Add-ons site.
Why to bother people to make them search, find, and install something which by default is not intended to work with the given browser?

rat tot nhung van chua cai dat duoc, se tim hieu va co gang cai cho duoc de hoc

A very good addition to firefox. A great addition for a web developer!

slowed down website loading drastically for me.

thanks