per-user XPI install?

Hello,

I apologize if this is a FAQ, but perusal of Google and previous 
messages in this newsgroup don't seem to indicate so.

The problem looks like this: I have a Mozilla 1.0 installed from a 
Debian package. That is, installed system-wide by root user. 
Consequently, non-root users are unable to install XPIs, because 
/usr/lib/mozilla is protected by Unix permissions to them. I know that I 
can browse to the installation of a particular XPI as root, then (for 
some XPIs) restart Mozilla to register new components. The question is - 
is it at all possible to install components for system-wide installed 
Mozilla on a per-user basis? That is, Mozilla stays in /usr/lib/mozilla, 
but for a prticular user, there's something only s/he needs in his 
~/.mozilla/.../chrome directory?

Thanks a lot in advance.

-- 
/\/\ike

P.S. Could you kindly CC your replies to my email address, as I do not 
check this newsgroup regularly?