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Exploitation of this vulnerability may allow a remote attacker to execute arbitrary code or cause a denial-of-service condition.
However, Mozilla states [mozilla.org] that
This is being fixed primarily to address stability concerns. We have no demonstration that this particular crash is exploitable but are issuing this advisory because some crashes of this type have been shown to be exploitable in the past.
Either way, get your patch.
Looks like I'm one of the testers.
I am not that impressed to find the update was "pre-release". There was no mention of that when it told me that the update was available.