Bren posted about this a good while ago, but I get so much use out of it that I figured I’d spread it around again.

If you accidentally close a tab you can bring it back from the netherworld by hitting Shift+Cmd+T (on a Mac) or Shift+Ctrl+T (on Windows).

This is so incredibly helpful when you get overly close-happy with your tabs, and go too far. Or, in my case, if you just aren’t thinking, this will resurrect the results of your errant clicks.