Switch flash to html5

http://www.idownloadblog.com/2016/04/26/how-to-remove-adobe-flash-from-mac/

if you stumble upon a piece of Flash content on the web that you want to view but hate the idea of re-installing Flash Player, simply use Google Chrome for these purposes. Google’s browser has built-in Flash Player, but it’s sandboxed to prevent Flash vulnerabilities from affecting the rest of your system.