Web Developer Extension
The Web Developer Extension is an excellent extension for Mozilla and Mozilla Firefox. It adds a toolbar, a menu, and a contextual menu full of extremely useful web developer tools.
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About the author
Roger Johansson is a Swedish web professional specialising in web standards, accessibility, and usability. More about me and this site.
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Comments
Indeed, this extension is priceless. I was disappointed though that Firefox 0.9 didn't recognize it. :( Had to revert to Firefox 0.8.
Weird. It works fine with Firefox 0.9 for me.
Works in 0.9 for me too.
Also pricesless: RSS Reader panel (let's me see updates to this site) ie view, which let's me open a site in IE and use IE's web archive format to save a web page
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