No word at Mozila.org yet, only reports from 'security' software companies.
Of course, even that kid that cried "Wolf" was right, once!
The fault in javascript "can error when processing JavaScript code handling e.g. HTML "font" tags and can be exploited to cause a memory corruption."
Just leave javascript disabled as much as possible. "Avoid untrusted sites and links." Now, where's that 'untrusted sites' list...