I have been using Firefox for many years now. Firefox 19.0 on a Mac OS X 10.6.8 Lately when I open and view some web pages an Icon with 'MSN Entertainment -.mp4' appears. Some sessions leave as many as 15 to 20 of these Icons. I can not open them with any thing. Did I do something wrong or what. I can't seem to find out the answer. They do not appear when we use Safari