I have had to revert to version 16.0.2 - which works perfectly - because 17.0.1 is virtually unusable on this laptop. I've never had this problem before and I've been using Firefox for many , many, years. It's basically a graphics issue. I can't see my home page if my bookmarks list is in the sidebar - it's just black. But if I close it, the page renders OK. If I try to change pages it seems to be OK. Then as soon as I try to open my bookmarks again the page goes black. If I try scrolling the black part i can see the page in the background but as soon as I stop scrolling it goes black again. If I try long enough, the page will sometimes render, but as soon as I try to do something on the page blocks of it will disappear and then come back if I move the mouse around on it. - And variations of this kind of nonsense. It's a very difficult thing to describe. I've tried restarting Firefox with my addons disabled, and that seems to fix the problem, but I can't find out which is causing it because when I restart with the addons enabled again in order to stop them individually the page rendering issue makes it virtually impossible to do anything, because I can't navigate properly. I've reverted to 16.0.2 permanently for a while, but every time I try to reinstall 17.0.1 the same thing happens all over again. of course Ff keeps prompting me to that there is a newer version and don't I want to install it etc., because of security issues etc. but there doesn't seem to be any point, unless anyone out there has any suggestions as to what's causing this really annoying and frustrating problem.