I have created a new profile like the link you sent suggested it, and today I manage to reproduce the crash. Once more, I simply switch from an application (The Gimp) to Firefox. Uploading the new crash report failed again with apport. So I'm adding it as an attachment.
** Attachment added: "Apport generated report from Firefox crash" http://librarian.launchpad.net/7034517/_usr_lib_firefox_firefox-bin.1000.crash.gz -- Firefox crashes often when switching from an application to it https://launchpad.net/bugs/96446 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
