Compile portable FF question --with-user-appdir= ?

Hi,

I am trying to create a portable FF for linux and it's pretty much done except FF looks in ~/.mozilla/firefox/* for pluginreg.dat upon start.

I remember reading this was an issue when Mr. Haller was first creating portableFF for Windows.

So, if I compile with "--with-user-appdir=.CustomDir" FF will not look in ~/.mozilla, correct?

I don't want FF creating any dirs on the HDD and right now if ~/.mozilla/firefox/pluginreg.dat does not exist FF creates it.

Can I compile without specifying a dir, eg:
--with-user-appdir=
Would this prevent FF from searching/creating dirs/files on a HDD?

Mr. Haller,
Do you have to use any other special compile args when you build FF? Does FF access the HDD other than above?

(I know your apps are for Windows but I thought you could lend your expertise below...)

I edited the "firefox" script as so:

MOZ points to the USB (this should match --with-user-appdir correct?):
MOZ_USER_DIR="\.mozilla/firefox"

$HOME is modified to the USB:
*was: "${HOME}/${MOZ_USER_DIR}/init.d"
*now: "${MOZ_USER_DIR}/init.d"

Moz_libdir points to USB:
moz_libdir=\lib/firefox-2.0.0.3

MRE_HOME points to USB:
MRE_HOME=\lib/mre/mre-2.0.0.3

Thanks for any help or guidance,