LT one is a 8.1 LT two is a 7

8 out of 10 times this problem happens it is on Facebook and the rest is elsewhere on the internet and it happens upwards of 45 - 50 times an hour. While that sounds like an astoundingly large amount of times we have become so used to it that it has only become a minor irritation as we love FF so much. The "Not responding" length of time is between 3 seconds to 15 - 20 seconds and then it starts responding again. I have disabled all extensions and it still does it. It started update before last.