The latest version of Firefox is 36.0.4. It was released on March 21 in response to a successful hack against the browser at the recent Pwn2Own contest. The Security Advisories page describes the vulnerability as Privilege escalation through SVG navigation.
In related news, all four of the major web browsers were successfully hacked at Pwn2Own.
Rants and musings on topics of interest. Sometimes about Windows, Linux, security and cool software.