This is a pretty cool extension that allows you to switch rendering engine for any tab from within Firefox. Basically, you can view any page in Firefox either using the native Firefox rendering engine, or you can use IE to render the same page without having to leave Firefox. The best part is that you can still use all your cool Firefox debugging tools (Firebug, Yslow…) when you are using the IE rendering engine. For Windows only. IE Tab :: Firefox Add-ons

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Tags: firefox, debugging, Internet Explorer, IE, add-on