Taskbar Previews is a real-time thumbnail of the window displayed when you hover over it’s icon in the taskbar in Windows Vista and 7. If you have noticed, the open tabs of the Internet Explorer are also displayed in the taskbar previews but other browsers are not supported. However, with a small trick, you can enable Taskbar Previews for Firefox 3.6 in Windows Vista and 7.
How to enable Taskbar Previews for Firefox 3.6?
1) Open Firefox 3.6 and in the address-bar, write ‘about:config’ and press Enter.
2) Click ‘I’ll be careful, I promise!’ button and you will be presented with a huge list of configuration options.
3) In the ‘Filter’ box, write ‘browser.taskbar’ and you will be able to see some entries below.
4) Double-click the entry ‘browser.taskbar.previews.enable’ to set it to ‘true’.
There you go! You’ve unlocked the ‘Taskbar Preview’ visual treat for Firefox. 
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That’s quite a handy tip man..Thanks for sharing..
Glad you liked it. Firefox 3.6 has many such under-the-hood treasures. I’ll post them as I find them.
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Nice tips, dude but it already show the preview of open window in my taskbar without doing above tricks ? Well Firefox 3.6 is sill slower than chrome 4
@RRH thats good for you
I had to turn on the feature using the above trick. Enjoy!