I can't open links in most applications unless firefox is already running.
I've tracked this down to an application called gnome-open that handles the opening of URLs within most applications.
If I run it from the terminal I get this error message:
richard@richard-desktop:~$ gnome-open http://www.google.com
richard@richard-desktop:~$ Error: No running window found
If I do the same with a firefox window open it works fine.
Anyone know what's going on here?