NPAPI plugin support will be disabled for everything except Flash

For many years, Mozilla has been trying to free the Web from plug-ins, since they are the point of reduced browser performance, security, and usability.

Starting from animation effects, video playback, file dragging, clipboard manipulation and interactive 3D games, video chats, etc. - today everything can be implemented without the use of plug-ins. Firefox offers an integrated PDF viewer and supports DRM content.

Microsoft recognized Silverlight as obsolete. Oracle reported that Java browser plugin is also outdated. Since April 2016, Apple has stopped supporting QuickTime for Windows. For OS X, QuickTime support has been disabled since 10.9 Mavericks.
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Thus, support for NPAPI plugins in Firefox has been removed since October 2015 * from version 52 on. With the exception of the still popular Adobe Flash Player.

* I'd add to myself that we are talking about beta versions of the browser, which will be released in the future. Currently the latest publicly available version is 49.0.2.

In 64-bit versions of Firefox for Windows, only two NPAPI plug-ins remained working - Flash and Silverlight *.

Web developers should create and implement plans for replacing content that requires plug-ins, including Java applets and Silverlight applications with alternative technologies.

For corporate users who require Java support, there is a Firefox 52 ESR (Extended Support Release), which will retain the ability to run Java for May 2018.

By the way, I'll add here on the topic, so as not to create a separate article:
This information is official:

Mozilla plans to discontinue support for all NPAPI plugins, with the exception of Flash, in March 2017, when Firefox version 52 will be released.

Somewhere leaked information that Firefox will go to PPAPI. Adobe is already ready for this in terms of the Flash Player. There is a chance that Firefox for Desktop will already have Flash Player pre-installed out of the box, as implemented in Google Chrome. And updates will come in the same way. But this is all "talk in the kitchen." What will happen in the end - we'll see. I can say one thing - no one is going to refuse Flash Player. Maximum - they screw him nuts to be in a marketing thread. But the flash game will still live exactly.