Everytime I hit ' button, it goes to the find thing ( you know, when you hit ctrl+f). This has happened to me before, but it suddenly stopped doing it. Now it started again.
Yeah, restalling it might do the magic. Might be a virus aswell, i mean who knows what those suckers do.
Don't understand why someone would make a virus to change ' to ctrl+f.. Anyway, make sure someone hasn't made any hotkeys on your pc or resintall firefox.