Comment 14 for bug 86103

Confirmed that the workaround does NOT work, latest libxcb:

frank@tembo% apt-cache policy libxcb1 /home/frank
libxcb1:
  Installed: 1.0-1.1ubuntu1
  Candidate: 1.0-1.1ubuntu1

frank@tembo% zcat /usr/share/doc/libxcb1/changelog.Debian.gz | head /home/frank
libxcb (1.0-1.1ubuntu1) feisty; urgency=low

  [ Timo Aaltonen ]
  * debian/patches:
    - 100_allow_sloppy_lock.diff from Novell, workaround to the various
      'Assertion `c->xlib.lock' failed"' -bugs by setting an environment
      variable LIBXCB_ALLOW_SLOPPY_LOCK to any value and the check will
      simply be ignored.

Still crashes java applets in Firefox