I have a mac. At first the browser was really slow and the spinning circle would not go away. I forced quit. When I opened the browser most of my tabs with sites came back except a few although when I clicked on them the showed the web address that was there. So I closed them and tried re-typing and the address but it would not connect, it just stayed on the new blank tab. Firefox has been really slow over the past few months and it keeps crashing.