This is quite possbily the greatest Firefox shortcut ever. I use my web history as a substitute for bookmarks but often times I mistype some urls and these get saved in the dropdown. Now I can remove them individually without clearing the entire history. This not only works on the url bar, but in ANY form in firefox, like logins! Mistyped your email that one time? Select it and hit Shift-Del and it’s gone.
You may not need this now, but one day you’ll thank me!

December 10th, 2007 at 7:17 pm
ok, I’ll thank you now
thank you!
January 1st, 2008 at 8:10 am
Awesome - thanks very much!
June 18th, 2008 at 12:44 pm
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Music-Cave
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