Adobe has not supported Android with their Flash Player Plugin since last update on September 10 201'''3'''. Mozilla is not going to allow to use such a '''vulnerable''' Plugin in Firefox on Android and that would be a huge security concern. Besides many sites have long since dropped support of the ancient Flash 11.1.x branch. Mozilla has no plans to make their own Flash Plugin for Android. No need to make such a Plugin for desktop Firefox (as Adobe still supports). Mozilla did experiment with a player to make swf as HTML5 but Shumway has been discontinued since 2015. https://en.wikipedia.org/wiki/Shumway_(software) Besides the work to make a Flash player Plugin for Android would be a waste of time and resources. In a year the desktop web browsers will have less support for Flash plugin and Adobe is in process of discontinuing their own Flash Player Plugin with End of Life in late 2020. At that point any websites still only using Flash for video, audio, games will be outdated or behind the times.