If you are a Firefox user, you should have already been prompted to upgrade. If not, go and grab the latest version. This is primarily a bug fix release, and these were squashed:
- chrome: scheme loading remote content
- Crashes with evidence of memory corruption (rv:1.8.0.5)
- XSS with XPCNativeWrapper(window).Function(…)
- UniversalBrowserRead privilege escalation
- PAC privilege escalation using Function.prototype.call
- Privilege escalation using named-functions and redefined “new Object()”
- JavaScript engine vulnerabilities
- JavaScript new Function race condition
- Native DOM methods can be hijacked across domains
- Memory corruption with simultaneous events
- Javascript navigator Object Vulnerability
- Code execution through deleted frame reference