Thumbnail Previews for All Opened Tabs in Firefox 3.6 on Windows 7

If you are running the most recent release of Firefox 3.6 on Windows 7, there is a must-to-do tweak for your browser.
By default, Firefox 3.6 shows only single thumbnail when you move your pointer over its icon in taskbar in Windows 7.

But what if this Firefox window contains 4 or more different separate tabs opened? To see all the tabs, you again have to maximize the window and scan all the tabs.
Follow these steps to enable thumbnail previews for all opened tabs in Firefox 3.6 on Windows 7:

1. Open Firefox 3.6 and type about:config in the address bar. Click to past the warning dialogue box and open the preferences page.

2. Use the filter box to search for the entry browser.taskbar.previews.enable. By default it is set to false. Double click this entry to toggle the setting to true.

3. That’s it. Now restart your Firefox browser and open multiple tabs. Now minimize the window containing these tabs. Now when you aim the pointer at the taskbar again, you will get the thumbnail for all opened tabs simultaneously.

Now thumbnail for every tab, even if it is in separate window, is now visible from taskbar preview: