ubuntu-bug does not start firefox, so unable to report a bug

[Ernst]

Most of the time I start 12.04, I get a message that a serious error occured. So, I want to report this bug and ubuntu-bug allows me to view the details etc. I see it is about telepathy-haze. This component is indeed not working correctly (no libpurple accounts in Empathy). However, if I press continue, I would expect Firefox to open launchpad, so I can report the bug.

However, nothing happens. So, therefore this bug report.

This bug report is also made using ubuntu-bug, but inititated by hand. Maybe that's helpful to locate the cause?

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: apport 2.0.1-0ubuntu7
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sat May 5 12:54:04 2012
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100122)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: apport
UpgradeStatus: Upgraded to precise on 2012-04-27 (7 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[osprey (theosprey)]

Same behaviour trying to report a bug on gvfs.
Application crashes, ubuntu-bug shows the dialog with details to fill the bug, but clicking on "continue" just closes the window. No broweser window is opened.
The files in /var/crash are created correctly.