/etc/X11/Xsession.d/06debian-edu-firefox-ltsp is in debian-edu-config 1.818+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # This is a -*- shell-script -*- fragment called by /etc/X11/Xsession
# Reduce X memory usage caused by Iceweasel when logging in from thin
# clients. See
# <URL: https://bugzilla.mozilla.org/show_bug.cgi?id=395260 >
# for background information.
if [ "$LTSP_CLIENT" ] ; then
MOZ_DISABLE_IMAGE_OPTIMIZE=1
export MOZ_DISABLE_IMAGE_OPTIMIZE
fi
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