About time too its so dated and useless i wish more browsers started removing support for flaky dodgy security hole ridden addons pushing company's to improve.
Annoying as it can be with Firefox sometimes i see a good thing happening.
Most of the major browsers have dropped support for NPAPI plug-ins. Chrome was first, followed by Edge (shipped without NPAPI support), and then Firefox.
Sky has until 2021.

https://support.microsoft.com/en-us/lifecycle/search/?c2=12905