If you happen to be using the latest Firefox [If not then download it now!!] and your using Windows 7 [If not start using it now… and Here's How ] then you’ll be please to find out that taskbar previews are now enabled. Well at least manually that is. Taskbar previews will enable a thumbnail preview at the taskbar for each tab open in Firefox. To enable them fire up Firefox and in the address bar type about:config. Then type browser.taskbar.previews.enable into the filter. Then double click it to make it True. That’s all folks!