Top 20 Essential Firefox Add-ons for Web Devs

Here’s a handy listing of 20 Essential FF Add-ons for Web Designers (and Developers, IMHO).

Some of these I already know about and use a few (Firebug, Web Developer, IE Tab, YSlow), but I intend to add a few more to toolbox (Window Resizer, Page Diff, CSS Viewer).  The rest seem to either not very useful to me personally, or are duplicates of functionality I already get from Firebug and/or Web Developer, but hey, YMMV!

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