Recent Firefox update caused crashes, possible hole
While there is no evidence of an exploit as of yet, Mozilla is taking a proactive measure to fix the issue before it could be.
A problem with stability which resulted in crashes and evidence of memory corruption was remedied in Firefox 22.214.171.124, however apparently the fix did not completely close any holes.
"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," Mozilla said in an advisory.
CLARIFICATION We made an adjustment to our headline for accuracy: The latest fix for Firefox 2, version 126.96.36.199, addresses the problem raised by the Mozilla advisory.