Mozilla no longer starts

[Fulko.Hew at sita.aero]

After this mornings boot, I can no longer start Mozilla.

If I start it from the command line, the prompt returns about 1 second
later with no error messages.

I did see once when I started it that 'ps' showed me it was trying
to (paraphrased here) "mozilla x-remote"  as if it was trying to connect
to an existing mozilla process, (that doesn't exist)

BTW.  I don't know if its related, but last night when I ran shutdown
it hung after the 'remove md" (sp) message.

Any clues?