During the transition from FireFox 55 to 57, I finally purged flash entirely. It was hardly being used anymore on the web sites I frequenting (ie. youtube, etc …).
I told the computer illiterates I lived with that some of their dumb video web sites might not play anymore with the removal of flash. I also told them to google the same video titles, to see whether the same video pops up on youtube or another less braindead web site.
Hopefully this will be the complete final end of all those annoying video/audio plugins which proliferated back in the late-1990s and into early-2000s. Thankfully most of these semi-useless video plugins fell by the wayside over the past 15+ years.