firefox 3.5 asserts on exit

[Kostik Belousov]

Each time I exit firefox 3.5 (and 3.5.1 too), I get

E: mutex-posix.c: Assertion 'pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0' failed at pulsecore/mutex-posix.c:52, function pa_mutex_new(). Aborting.
Abort trap

This is on up-to-date RELENG_7/i386.

The assertion seems to interfere with restoring of the session.
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