Closing as duplicate please see and continue with [/questions/1148123#answer-938726] ~J99 I'm looking for a Flash or HTML5 video player add-on so I can watch Youtube and other videos from Firefox 51.0 Beta. But all the add-on Flash or HTML5 players in the Firefox add-on library will download but refuse to install because none are compatible with the most recent version of Firefox. I have instructions for downloading and installing an Android 6.0.1 Marshmallow compatible flash player directly from Adobe's website. But there are two Android 6.0.1 compatible files names on the site, and I don't know which one to use. Should I download and install the Flash player file with the highest alpha-numeric filename, assuming that it is the most recent version, or should I wait until I can get a definative answer from Adobe? Oh,, and Happy Thanksgiving!