I use Firefox 25.1 with Avast Pro 2104.9.0.2008 and Windows 7. When I go to my home page, which is http://att.yahoo.com/ the news videos do not show. It is completely white where the videos should be. The only way I can get it to work is to disable the Avast Internet Security Add-on and restart Firefox. Is there a setting or something I can change that will make the videos work without having to disable this add-on?