This isn't exactly a problem to be fixed as of yet. But rather information research. I've read several viewer comments &/or articles from other sites about the ongoing security issues if one uses Adobe Flash. But when I play videos on websites or youtube videos, I have to activate the adobe flash player (an option I opted for in the add-ons). I keep it updated but am wondering if there is an alternative program that Firefox will support on my Mac using El Capitan. I'm not computer savvy enough to understand what it means that some favorite website have already shifted to HTML5 videos or alternative technologies (not exact quote). Are there any suggestions? Or am I not asking the right question?
Use this guide to troubleshoot issues when Adobe Flash Player video doesn't display in Firefox, Safari, Chrome. Find step-by-step instructions for problems on Windows and Mac OS.