Are you using Firefox browser? Friendly Computers found this article useful for windows 7 and Firefox users.
Firefox users, if you’re running the most recent release on Windows 7 you need to make a tiny tweak to your browser’s configuration. By default, Firefox shows a single thumbnail when you hover the mouse pointer over its icon in the Windows 7 taskbar with Aero enabled. Here’s what it looks like:
The problem is, this particular Firefox window actually contains four open tabs, and it could contain dozens. It sort of defeats the purpose of the Aero preview feature if you have to open a window before you can scan which browser tabs you have open. IE8 does it right, showing all open tabs in thumbnail previews when you point to its icon. So how do you add the same feature to Firefox 3.6? Simple:
Open Firefox 3.6 (or later) and type about:config in the Location Bar. You’ll have to click to get past this warning dialog box and open the Preferences page. Use the Filter box (or just scroll down) to find browser.taskbar.previews.enable in the list of preferences. Note that by default it’s set to false. Double-click to toggle the setting to true. The value in the Status column changes to user set and the entire entry turns bold to indicate it’s been changed. It should look like this:
And now aim the mouse pointer at the taskbar again:
Every tab (even if those tabs are in separate windows) is now visible from the taskbar previews. You can change the focus to any tab temporarily by pointing at it, and you can close any tab from its thumbnail preview using the X in the upper right corner.
