How to watch flash video on safari/mac without install flash?

Hi mac people,

i think many people are asking about this too, but i didn't find a true/info article to show you how,

so I ask again in here hopefully someone can give me an true answer!

I don't want to install flash due to security and some other disadvantage mentioned by other,

but video uploaded to Facebook still using flash, and youtube opened in safari, some video showed only 240p, 360p, 720p, it doesn't show 480p,1080p and 4k or 60fps version, but when I install bogle chrome, everything look fine, I get vey those option available, I heard google chrome has built in flash/sandboxed flash, not sure how it's work, but google famous at tracking so I don't want to use google chrome, so guys any way to use safari to view all those things?

Thanks!!!