Disable PDF display in Firefox

For Ubuntu Jaunty, the Adobe Acrobat (acroread) browser plug-in is not separate in the package mozilla-acroread anymore. Instead it is part of acroread unfortunately. One can simply remove the plug-in though using
sudo rm `locate nppdf.so`
and restarting the browser.
Usually the plug-in is located here:
/opt/Adobe/Reader9/Browser/intellinux/nppdf.so
/usr/lib/firefox/plugins/nppdf.so
/usr/lib/iceape/plugins/nppdf.so
/usr/lib/iceweasel/plugins/nppdf.so
/usr/lib/midbrowser/plugins/nppdf.so
/usr/lib/mozilla/plugins/nppdf.so
/usr/lib/xulrunner/plugins/nppdf.so
/usr/lib/xulrunner-addons/plugins/nppdf.so
/var/lib/acroplugin/nppdf.so