Good news! After several days with Memtest I have determined that my memory is fine and my motherboard is the culprit. Turns out it refuses to run anything in dual channel mode without stability issues and even with only one stick in it has issues at the stock settings for the memory. At the advice of the GSkill folks I have split up the sticks and slowed down the frequency and speeded up the timings and it is working great with no issues. FYI I left Firefox alone. Doesn;t seem to be a factor.
Thanks for the help,