Comment 4 for bug 81207

Still fails, but now I'm lucky enough to get an error message :-)

pandis@pandis-laptop:/var/crash$ sudo /usr/share/apport/apport-gtk
pandis@pandis-laptop:/var/crash$ Error: No running window found
The program 'firefox-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 761 error_code 3 request_code 20 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

It doesn't make a difference whether firefox is already running or not.