firefox3-bin crashes near arc4random_buf()

For a few weeks now firefox3-bin has been crashing semi-regularly for me.
Backtrace attached. I selected `Build a debugging image' but the resulting
binary is stripped, so no symbols.

I'm reporting this here since ISTR some changes having been made recently to
the arc4random* functions.

Has anybody else seen this?

-- 
Jos Backus
jos at catnook.com