Something is forcing closure of Firefox periodically (about once a week or so?). This happens whether I have Firefox open or not. If I have Firefox open at the time, the browser closes then reopens at a Microsoft Bing search page ("...goose...") and all the other pages I had open have disappeared. If it happened when the browser was not already open, the next time I open it the home page has been reset as above. As far as I can see, nothing else in my settings has been changed, but I have to go in and manually reenter my usual desired homepage. Are you doing this, is Microsoft doing this, or is some other interloper causing this? Do you know any way I can find out and stop it?