I’ve found a few shortcuts in Firefox that I love.

Ctrl-tab : switches among open tabs
Ctrl-w : closes the current tab
Ctrl-shift-t : re-opens the last tab you just closed

I also found a shortcut that I hate:

Ctrl-q : quits the whole program instantly
Ctrl-shift-w : closes the current window

I keep reaching for ctrl-w and hitting ctrl-q by mistake

This little plug-in, keyconfig, lets you fix that:

http://forums.mozillazine.org/viewtopic.php?t=72994

Enjoy.

-Peter