This is a Firefox addon makes Control+F close the Find box, just like opening it. It helps take the pain out the Finder box in the bottom left. One of the most annoying things to me is typing --in particular inside of a new message or a reply in gmail--and then for some reason I always get caught in the finder box and can't lose the focus unless I click that circled x.

It has nearly caused me to throw my laptop through the window on several occassions. What this addon does is it lets you click Control+F to close it -- the same way you click Command+F to open it. So, in the event that you get trapper in there, you can just click Control+F to get out and continue doing whatever you were doing.

To install it, click here: