Version 7.0.8 is out now. I have confirmed (based on reports originally posted in the forums; e.g. on http://ubuntuforums.org/showthread.php?t=187973) that if you download the Linux version of Adobe Reader from http://www.adobe.com/products/acrobat/readstep2.html and extract nppdf.so and use it to replace the one installed by the mozilla-acroread package (/usr/lib/Adobe/Acrobat7.0/Browser/intellinux/nppdf.so), PDFs work inside Firefox again.
FWIW, until an upgraded DEB is available to Dapper users (e.g. through backports), I have made a tar.gz (~2 MB) from that file so people don't have to download the entire 7.0.8 archive from Adobe (~40 MB) http://members.shaw.ca/Limulus/files/nppdf.so.tar.gz -- nppdf.so: undefined symbol: XtCalloc https://launchpad.net/bugs/41787 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs