Originally Posted by Alien Bob
That's strange, because Mozilla was going to issue that warning in Firefox only for Java 1.7 versions. The 1.6 series is not vulnerable to the 0day exploit.
According to Oracle, it looks like Java 6 is also affected:
("JDK and JRE 7 Update 6 and before
JDK and JRE 6 Update 34 and before")
A Java 6 update 35 is available at Oracle.
I don't know if OpenJDK has the same vulnerability. Does anyone know?