Installing plugins into $HOME/.mozilla/plugins

hi,

i would like to install a plugin in an XPI package into
the user's $HOME/.mozilla/plugins directory to avoid
the need for the root password for plugin installations.

however, Install.getFolder("Plugins") always returns the
systemwide plugin path (e.g. /usr/local/mozilla/plugins)
instead of the user's plugin path. as a workaround, i used
Install.getFolder("Current User") + "../../plugins", but
this will obviously fail if the user has relocated its mozilla
data directory.

i haven't found any reliable method to determine the user's
home directory from install.js. the only other method i could 
think of is including a shell script in the xpi, which will
evalute $HOME and install the plugin into $HOME/.mozilla/plugins.

i tested the XPI package using Mozilla 1.0.1,
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830
which seems to be a good choice to me as many red hat users have
this version installed.

regards,
matt