Unfortunately this is my life right now. When Chrome and Firefox dropped support for NPAPI a lot of enterprise customers intentionally moved their users back to IE 11. The loss of NPAPI has ironically increased IE 11's market-share, talk about unintended consequences...
I understand why they didn't but part of me wishes Microsoft had enabled NPAPI in Edge just so we'd at least get modern web standards even if NPAPI is bad and insecure. Instead IE 11's life is now another five years at minimal or until the last Java Applet, ActiveX control, or Flash page disappears.