Adobe’s Flash Player plugin is scheduled to be discontinued in 2020. Mozilla has published their Flash Player support discontinuation timeline. Firefox will disable the Flash plugin by default. Adobe has labeled Flash Player a security risk and never allowed iOS to support the vulnerable platform. HTML5, WebGL and HTML5 are the three technologies that complementarity provides the content platform that used to be solely only possible through Flash Player. Flash Player’s impending demise is also Firefoxs support with the old and insecure NPAPI plugin architecture.”]
Source: https://hackercombat.com/mozilla-disabling-support-for-adobe-flash-plugin-by-default/