I made this script, it opens in a new tab instead, it works for me in 
KDE  (and I've used similar in gnome).

Just change firebird to your mozilla bin and you should be good to go.

#!/bin/sh
mozilla-firebird  -remote "openURL($@, new-tab)" ||
exec mozilla-firebird "$@";


Tom Penney wrote:

>I've got an annoying little problem. I've installed Mozilla 1.6 on a RH9
>box running gnome. I can't open two instances of the the browser. When I
>try I get a window "Select User Profile" asking me to select one. There
>is one available profile "default" which is just fine with me. I select
>it and I get an error "Mozilla cannot use the profile "default" because
>it is in use. Please choose another profile or create a new one." It
>seems when I run /use/local/mozilla/mozilla it opens a whole new session
>when what I want is a new window. I can open new windows using the same
>"default" profile by right clicking a link and selecting "open link in
>new window" so how can I do the same from the command line? 
>
>  
>


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