I just did a "reset" of Windows 10 on a previously owned PC that was given to me. It seems to have worked fairly well at cleaning up and re-installing windows 10. The first thing I did was download and install Mozilla firefox 42.0 web browser because that's the browser I'm most familiar with using. I also switch my Windows settings to "high contrast" because I have vision problems. Everything seems to work fine except in the firefox browser when I go to certain web-pages the graphics on some web-pages aren't rendering at all, and all I get are large blank spaces where there should be graphics instead. Any ideas on how to fix this problem?