Keyboard shortcut for 'close other tabs'

Would anyone else find it convenient to have a keyboard shortcut for 'close 
other tabs'?

When I finish (or stop) doing something that requried several tabs open and 
I want to continue using FF for something else, It would be very handy to be 
able to close all but the current tab at one go with a keystroke, instead of 
reaching for the mouse and opening the tab context menu.

(If keyboard customisation were already available I could just set it up for 
myself ... if context menu items were in the list of assignable actions.)

R.