Made my first [Mozilla] Wiki post today, with my idea for a Search Service:User Interface Design improvement. Being that it's a Wiki and so anyone can edit parts of the document, I've included below my addition verbatim:
Search Box Context-Sensitive Menu, Go Option
Currently you can interface seemingly everything in Firefox with just the mouse, except for the search box where you need to press enter. Rather than a Go button taking up toolbar space, it would be handy to have the Go option in the context-sensitive menu.