It is always a big headache for UI developers to make a layout compatiable in all browsers, especially in Internet Explorer. Here we have some tools that make IE bug fixing easier and save testing time dramatically. 
1. IE Netrender (Firefox Addon)
It adds buttons, tools menu and contextual menu entries to render the current page with various versions of IE (5.5/6/7/8 Beta 1)
2. IE Tab (Another Firefox Addon)
Another great tool for web developers, since you can easily see how your web page displayed in IE with just one click and then switch back to Firefox. * But it can render only one version of IE (the version which is already installed in your PC) and works only with IE.
3. IETester (Freeware)
IETester is a free WebBrowser that allows you to have the rendering and javascript engines of IE8 beta 1, IE7 IE 6 and IE5.5 on Vista and XP, as well as the installed IE in the same process. * But still in alpha version and has some bugs
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