This bug: https://bugzilla.mozilla.org/show_bug.cgi?id=672671

The manifestation of this problem, if indeed it is this one, is devastating: my login session abruptly ends. This problem began after a possibly flawed update from Ubuntu 13.04 to 13.10.

After the update several 32bit libraries required by Thunderbird were missing. They were located and installed and the problem started at that point.

Environment: Ubuntu 13.10 with Kubuntu desktop 1.291 on 64-bit system.

Until resolved neither Thunderbird nor Firefox and be used.

11Nov 2013 firefox linux mint 15 I have this problem with firefox under my main user, supprisingly when under root user it gives the same error but comes up and runs ok. what may be wrong with glib different with root user.

under my main user it just gives the error and exits.

Hello.

I had the same error.
In my case, just had a permissions problem.

Respectively, or simply change the owner:

1. cd ~ /. thunderbird /
or cd ~ /. mozilla /
chown -R myuser:mygroup ./

Or watch an access error:
2. strace -ff firefox 2>&1 | grep " = -1 EACCES"

I solved this problem by deleting qtcurve-gtk2 qtcurve-kde4 and switching to a default for KDE widget style.