Tabs Power User
Do you have ten or more browser tabs open in most of the time like me? Then you might be a tabs power user...
If you're also like me, once in a while you need to close some of those open tabs to reclaim some of your precious computer memory. One too many clicks on the close button ( or control-w hotkey ) and "oh no, I just closed a tab that I needed!".
Not to fear, use the magic hot key control-shift-t to re-open the last tab you just closed. This works in most modern web browsers ( IE9, chrome, firefox ).