IETester is a free WebBrowser that allows you to have the rendering and javascript engines ofIE9 preview, IE8, IE7 IE 6 and IE5.5 on Windows 7, Vista and XP, as well as the installed IE in the same process. You can extend it with “DebugBar” from the same guys – this way its finally possible to have something like FireBug for IE6. I use it every day and it rocks.

http://www.my-debugbar.com/wiki/IETester/HomePage

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