I tried to add a keyboard shortcut for searching Google Bookmarks using the option in the right click menu, but when I try to use it, only a blank search box appears. How can I make this work?
I can't recall where I found this solution at the moment (I'll look for it), but the following entry for Location works:
I then added the keyword
[EDIT] Lifehacker has an article on Firefox quick searches complete with a set of bookmarks which includes a Google Maps shortcut.
Also, after some testing, I find the following simpler Location also works: