> Firefox limits NPAPI support (technology required for Java applets)
> 64-bit Firefox
> The 64-bit version of Firefox does not support NPAPI plug-ins,
> Firefox 52 and above
> Beginning with Firefox 52 (released March 2017), plug-in support is
> limited to Adobe Flash, and drops support for NPAPI, impacting plugins
> for Java, Silverlight, and other similar NPAPI based plugins.