Firefox freezes when I try to run a Java Applet

[David Hardstone]

Binary package hint: firefox-3.5

Description: Ubuntu 9.10
Release: 9.10

firefox-3.5:
  Installed: 3.5.4+nobinonly-0ubuntu0.9.10.1
  Candidate: 3.5.4+nobinonly-0ubuntu0.9.10.1
  Version table:
 *** 3.5.4+nobinonly-0ubuntu0.9.10.1 0
        500 http://gb.archive.ubuntu.com karmic-updates/main Packages
        500 http://security.ubuntu.com karmic-security/main Packages
        100 /var/lib/dpkg/status
     3.5.3+build1+nobinonly-0ubuntu6 0
        500 http://gb.archive.ubuntu.com karmic/main Packages

sun-java6-plugin:
  Installed: 6-15-1
  Candidate: 6-15-1
  Version table:
 *** 6-15-1 0
        500 http://gb.archive.ubuntu.com karmic/multiverse Packages
        100 /var/lib/dpkg/status

As per description, Firefox crashes when I open a page with a Java app embedded. I've tried removing my .mozilla directory, purging all sun-java6-* packages and starting again but the problem persists.
I will provide more details upon request.

ProblemType: Bug
Architecture: i386
CheckboxSubmission: 9a0e79ceeb808121641c92d926d37d68
CheckboxSystem: e704f33cc0866ff0f0256a33de39ea1c
Date: Sun Nov 1 14:37:49 2009
DistroRelease: Ubuntu 9.10
KernLog:
 Nov 1 14:26:30 dave-laptop kernel: [ 6253.431917] type=1503 audit(1257085590.887:24): operation="exec" pid=4869 parent=4868 profile="/usr/lib/firefox-3.5.*/firefox" requested_mask="::x" denied_mask="::x" fsuid=1000 ouid=0 name="/usr/bin/apturl"
 Nov 1 14:26:40 dave-laptop kernel: [ 6263.010515] type=1503 audit(1257085600.466:25): operation="exec" pid=4871 parent=4868 profile="/usr/lib/firefox-3.5.*/firefox" requested_mask="::x" denied_mask="::x" fsuid=1000 ouid=0 name="/usr/bin/apturl"
Package: firefox-3.5 3.5.4+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-14-generic i686

[Patrick Brueckner (madmuffin)]

I can confirm this behavior.