Listen, browsing Newgrounds is cool and all. You can find a ton of awesome things like old Flash animations and games that made your childhood, or discover some new ones that you didn't even know existed but still get a good kick of nostalgia from them, but the annoying part is that ever since Adobe stopped supporting Flash it's been hard trying to find some stuff here that's still alive. I did hear about a "Newgrounds Player" extension get thrown around here and there but I can't really seem to find anything related to it. There's also this thing called "Flashpoint" which seems promising and I might check that out later. Sorry if I'm just rambling or going on a long tangent but I just wanted to get this out of my system.
EuropeanRat
ruffle browser extension, works amazing