MozillaFirefox was updated to 10.0.1 to fix critical bugs
and security issue.

Following security issue was fixed: CVE-2012-0452: Mozilla
developers Andrew McCreight and Olli Pettay found that
ReadPrototypeBindings will leave a XBL binding in a hash
table even when the function fails. If this occurs, when
the cycle collector reads this hash table and attempts to
do a virtual method on this binding a crash will occur.
This crash may be potentially exploitable.

Firefox 9 and earlier are not affected by this
vulnerability.

https://www.mozilla.org/security/announce/2012/mfsa2012-10.h
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