Mozilla has fixed 14 security vulnerabilities in Firefox, including four critical flaws that could allow remote code execution. There also are six high-severity vulnerabilities fixed in Firefox 22. The new version of Mozilla s flagship browser is a major release in many ways, not least because of the considerable number of security fixes it contains. Among the vulnerabilities is a memory problem discovered by a well-known security researcher named Nils, of MWR InfoSecurity, who is a frequent contestant at the Pwn2Own contest at CanSecWest.
Source: https://threatpost.com/14-vulnerabilities-fixed-in-firefox-22/101091/