Just added a little script to open URLs given as argument in a smart way, that means in a new tab if a mozilla | firefox session is running, or launching it and opening the page if it isn't. Very useful with programs that have to open web links using mozilla (in my case gaim, but works also for lopster, xchat, etc).
This script is written for firefox, but to use it with mozilla, just change the $BROWSER variable to "mozilla".
View it here !!