Shumway can not be installed to Firefox for Android latest stable

[JanuszChmiel]

Dear specialists,

Why It is not possible to add this perfect addon to Firefox for Android? When I type directly The address to download .xpy addon, Firefox prompt Me to unblock installing this addon, when I allow that, installation is not successful. There is no error message, but addon simply do not install. How complex would be to make this addon compatible with Android release of Firefox? Old Flash player from Adobe is no longer supported by Firefox for Android. And there are still pages which relay on .swf files and many WEBINAR systems. Or do I ave to use some special Firefox tweak so Firefox will accept installing of this addon also for its Android variant of Firefox?
Thank you very much for yours answers.

[demurgos]

Possibly related to the previous issue: #2446.

The extension is incompatible with the latest versions of Firefox and is no longer maintained. I do not know if is compatible with older version of Firefox for Android.