Critical JavaScript vulnerability in Firefox 3.5

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http://forums.fedoraforum.org – Does anyone know anything about this? I saw a brief mention of it on ALE (Atlanta Linux Enthusiasts) mail list pointing to; http://blog.mozilla.com/security/200...in-firefox-35/. The only thing I've noticed is while I was browsing through DSLRs on Amazon.Com on the 3rd open tab all of a sudden my dual core CPU shot to 100% and core temps shot to 240 degrees each core. As soon as I was able to back out everything went back to normal. While typing this I have 4 tabs open CPU usage is at 22% running about 130 - 150 degrees/core. I'm not sure if this is an indication of an "attack", if so what do I need to make sure I don't have any violating code loaded onto my system? (HowTos)