Either another product or a source of older Flash might do it. Version 18-something is stable as a pig on stilts.
Most website sites that use Flash also support HTML5 video. If you do not want to use Flash just uninstall it and HTML5 should take over for you. However, it depends on the websites if they choose to make HTML5 available.
Thanks. Yes, it seems that some do and some don't. (I had uninstalled Flash. It played havoc with Firefox.)
Works OK for mine integrated with Chrome or Windows 8+... Actually, there may be something like Photon Browser for mobile.
There's Gnash for Linux but it's not going to play absolutely everything Flash will (but it will work for a lot of stuff). There's another piece of software for Linux that's similar but I forget what it's called.
HTML5 Video Everywhere https://addons.mozilla.org/en-US/firefox/addon/html5-video-everywhere/?src=search It has its limitations. I use a combination of Palemoon / Flash / MBAE, and I find it particularly stable since version 18. Before the update I was getting the occasional crash when exiting full screen mode.