Comment # 4 on bug 1189811 from Fabian Vogt

(In reply to Robby Engelmann from comment #3)
> after deactivation of the plasma-integration plugin everything works fine
> again.

You mean kmozillahelper? That's a separate process and can't cause segfaults
inside the firefox application. It's most likely the code in firefox itself,
reassigning.

A backtrace would be useful.