Apport should pop up and ask you to submit a bug. If you didn't see that, then we didn't get the bug. Could you check /var/crash to see if there's an entry for firefox? You can use that to submit the bug by doing:
ubuntu-bug /var/crash/CRASH_FILE_GOES_HERE
and substituting your crash file name there.
@John Rose
Apport should pop up and ask you to submit a bug. If you didn't see that, then we didn't get the bug. Could you check /var/crash to see if there's an entry for firefox? You can use that to submit the bug by doing: CRASH_FILE_ GOES_HERE
ubuntu-bug /var/crash/
and substituting your crash file name there.