Web Developer

The Web Developer add-on for Firefox adds a menu and a toolbar with various web developer tools.

Not in the Top 100 in 2013

Website Cost Availability
Web Developer Free Download
2013 2012 2011 2010 2009 2008 2007
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Comments from some of those who selected Web Developer as one of their Top Tools 

“Great extension for Firefox that should be available in every other browser. It’s useful for debugging XHTML/CSS sites. Greatest timesaver is a feature that allows me to create CSS quickly LIVE without reloading pages” Teemu Arina
“The Web Developer toolbar is my favorite!” B J Schone