The sandbox icon suggests that Firefox (V44.0.2) is sandboxed, however, it really never loads. The Sandboxie site is to wild so I figured I'd check here. I know Bo has helped folks many times, including me. Googleling, the closest thing I came up with was that it could be Norton security but really couldn't find a solution. For what it's worth, Sandboxie works fine on my x64 W10 desktop with Norton. Thank you!