Disable XUL ?

Hi,

I'm new to multiZilla,  Actually, I'm not even new.  I can't 
get it to install.

I'd really like to get it working.  I've got Mozilla 1.6.3_2 - I know that
because of the FreeBSD port name.

Here's what the about window says...  Of course I just built it tonight.

Mozilla 1.6
Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.6) Gecko/20040412


When I try to install multizilla as root, I get this error.

DOES_NOT_EXIST  	 -214  	 The specified file cannot be deleted because it does not exist.


Then when loading the installation page, it shows this.

Disable your XUL cache (QPrefs/Cache Settings/Disable XUL Cache) for mozilla builds 20040309-20040324 because of Mozilla bug 237407.

That seems like good information.  But I can't figure out what
to do with it.   I found conflicting information on how to turn off 
the XUL cache by making an entry in user.js.  Which I don't have.

I also found instructions on finding it in preferences.  Which I also
don't have.

any idea's?

I'm liking galeon less than ever before, It's becoming as detestable as the rest of gnome.  
So I switched to mozilla.  But I miss some of the nice tabbing behavior in galeon.

thanks,

Eric