Ever wonder why Firefox doesn’t show previews of all the open tab pages when you hover over it in the task bar?  Well, by default, the Aero preview does not show them like IE does.

You can enable it as follows:

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.

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.

This tweak was presented by Saguaro PC Tech.