When I am in Facebook I have a blue spinning wheel by my cursor that comes and goes as I move across the page. The wheel is there when I am in open space but goes away when I scroll over a picture or a post. It is crazy and makes ME crazy. It is only when I am on Facebook....does not happen on any other site. What is the deal....I have rebooted multiple times with no improvement. This just started a couple of days ago. I use FireFox and am running Yosemite 10.10.3