I understand it is no longer intended to include Shumway in Firefox. Maybe you can get news or information from the mailing list if it is still active

• http://groups.google.com/group/mozilla.dev.shumway

It looks like the extension is still available from http://mozilla.github.io/shumway/extension/firefox/shumway.xpi

See also

• Add-on signing in Firefox_override-add-on-signing-advanced-users

John99 said

I understand it is no longer intended to include Shumway in Firefox. Maybe you can get news or information from the mailing list if it is still active

• http://groups.google.com/group/mozilla.dev.shumway

It looks like the extension is still available from http://mozilla.github.io/shumway/extension/firefox/shumway.xpi See also

• Add-on signing in Firefox_override-add-on-signing-advanced-users

If it is no longer meant to be included, then how are things meant to work? Has Shumway been terminated or perhaps included by default or something meaning that I should delete the version I installed?

I will contact their mailing list if it is still activate and ask them there, but some sources for your information and what I should do would be nice if you have them.

I just hear general chat and am always aware that Firefox has limited resources. The mailing list does not look very active. It's wiki page is inactive

• https://wiki.mozilla.org/Shumway
  • https://wiki.mozilla.org/Shumway/Status/2015-06-29

Firefox is dropping support for most plugins, but FlashPlayer itself is so popular still that it will receive support for a while longer

• https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/

As can been seen here Shumway has now been added to the Mozilla "Graveyard" so is now no longer supported. Sadly.