Crash when dragging bookmark in Firefox

[JanCeuleers]

When I try and drag a bookmark on Firefox's bookmarks toolbar, lightdm crashes and I'm taken back to the login screen.

janc@mordor:~$ lsb_release -rd
Description: Ubuntu 12.04.3 LTS
Release: 12.04
janc@mordor:~$ apt-cache policy lightdm
lightdm:
  Installed: 1.2.3-0ubuntu2.3
  Candidate: 1.2.3-0ubuntu2.3
  Version table:
 *** 1.2.3-0ubuntu2.3 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.2.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
janc@mordor:~$ apt-cache policy firefox
firefox:
  Installed: 24.0+build1-0ubuntu0.12.04.1
  Candidate: 24.0+build1-0ubuntu0.12.04.1
  Version table:
 *** 24.0+build1-0ubuntu0.12.04.1 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
        100 /var/lib/dpkg/status
     11.0+build1-0ubuntu4 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.3-0ubuntu2.3
ProcVersionSignature: Ubuntu 3.5.0-41.64~precise1-generic 3.5.7.21
Uname: Linux 3.5.0-41-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
Date: Sat Sep 28 07:42:09 2013
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[JanCeuleers (jan-ceuleers)]

Actually, the crash happens when anything is dragged in Firefox:
- attempt at reconfiguring the toolbars
- dragging a link
- ...

[müzso (bit2)]

The not so funny thing is that I get this in Firefox 25.0.1 on Mac OS X 10.6.8 too! :-( The desktop manager does not crash, only Firefox does. But that's quite annoying as well. Most probably there's an upstream bug about this, but Google didn't spit it out on my first attempt to find it.

[müzso (bit2)]

I didn't find any related upstream bugs in Mozilla's Bugzilla database either (searched for "crash bookmarks").

[JanCeuleers (jan-ceuleers)]

I originally reported this issue but can no longer reproduce it