Solve : Firefox 39.0?

1.	Solve : Firefox 39.0?
Answer» Am using an HP Envy laptop with Windows 8.1 Home, McAfee Anti virus and Malwarebytes are utilized 2-3 times a week. As is Ccleaner. But seems the system (Browser ?) is a little slower, ESPECIALLY in Face Book where in addition to the mouse pointer is the small blue CIRCLE going around indicating something running in the background. A check into Task Manager doesn't INDICATE ANYTHING unusual. Anybody got any ideas to narrow down the possibilities? 1) Just Facebook or other sites too? 2) Does the same thing happen with other browsers or just Firefox? 3) What happens with Firefox with add-ons disabled?

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