Mozilla announced that it would stop supporting the NPAPI plug-in by the end of 2016
According to the latest blog post, Mozilla announced that it will stop supporting the website plug-in application interface (NPAPI) Plug-in by the end of 2016. Mozilla said that many services including streaming media video and clipboard access are implemented through the NPAPI and used as native Web API activation. To reduce the burden on the system and improve performance, Mozilla wrote in the blog: "With the rapid development of browsers and web pages, the NPAPI has become quite old. The plug-ins implemented on this basis have performance, crash, and other problems, and there are potential security risks for Internet users ."
Google's Chrome and Microsoft's Edge browsers have already announced that they will not support the NPAPI plug-in, so Mozilla needs to step up. However, Firefox users who want to let Flash die may be a little disappointed. Mozilla says it will still treat Flash for Firefox with "exceptions to general plug-in policies.
NPAPI Plugins in Firefox [Mozilla]