If you are using recently released Mozilla Firefox 3.6 or 4.0 version, you might have noticed that it supports Taskbar preview thumbnails for each tab in Windows 7, i.e. Firefox shows preview thumbnails for each tab when you hover mouse cursor over its taskbar button as shown in following screenshot:

Some of our readers found it annoying and want to disable this new functionality. So here we are giving step by step procedure to disable Taskbar tab previews in Mozilla Firefox:
1. Open firefox and type about:config in the addressbar and press Enter. It’ll confirm, click on I’ll be careful, I promise! button.
2. Now type taskbar in the Filter box. It’ll show following entries:
browser.taskbar.previews.cachetime
browser.taskbar.previews.enable
browser.taskbar.previews.max
3. The entry "browser.taskbar.previews.enable" would be set to true. Double-click on it or right-click on it and select "Toggle". It'll set its value to false.

4. That's it. Now Firefox will no longer show preview thumbnails for each tab in Taskbar.

This article was posted by VG in following section: Mozilla Firefox, Troubleshooting, Windows 7.
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Arvin V. Malabanan
wow that is a very cool feature of new firefox. who wants to deactivate that? i wish opera have taskbar tab preview support too but it's ok because my machine can only handle xp :)
astroX
wow, this actually helped me to turn the preview tabs on in the new beta 3 LOL
I don't understand why the new beta 3 has by default the taskbar preview tabs disabled. :S
Blue
hey vg, what is that Firefox theme in the screenshot?
VG
^^ Its AeroVG theme for Windows Vista or 7.
BillyBook
@astroX same here. I don't know why it doesn't have them on by default either. I really like it as a feature
VG
^^ As I told earlier, its because AeroVG theme which changes look of Menubar also. :)
Thomas
@Blue
that is not a theme of firefox.....
just right click on a button then customize en tick the use small icons option:P and press ok
sorry for bad english..
Carlos
@Arvin I want to disable that because it interferes with the firefox panorama manager...
Btw, tks a lot for the tip, it really helped.
QIN Hongdong
This may not be a good feature for all users.
It significantly slows you down when you're switching between many windows and several tabs in firefox.
Gary Teresi
Does not work for me, please help!!!