How to disable Firefox Taskbar Preview in Windows 7

Windows 7 Taskbar shows a Thumbnail view of all the open windows and applications, including open tabs in a web browser. You can maximize a browser tab by looking at its thumbnail preview.
Although this is great feature added in Windows 7, but it has certain restrictions. Firstly, the number of thumbnails that can be seen at a time are limited based on the screen resolution. Once that limit is reached the thumbnail preview is changed into a list mode.Secondly, for a power user, like me, who mostly open a number of tabs in a browser at a time, it is not a great feature. It is more than a hindrance. If you are one of those like me, here is how it can be disabled. I am using Firefox here.

1. Open Firefox and type about:config in the address bar. Press Enter.
2. In the Filter box type browser.taskbar.previews.enable.
3. Double click on it, it will be changed to False. Actually it acts as a toggle, if it is false, it will be changed to true, and if it is true it will be changed to false.
4. That’s it. Restart Firefox.