Java в Firefox

Renable NPAPI Plugin Support in Firefox 52

If there’s a particular NPAPI plugin that you rely on there is (for now) a way to override Firefox defaults and re-enable NPAPI support.
Reader Grof has all the details.
“This is important, because some websites are still using Java plug-ins, like for example our government site for signing documents. You can’t work with government if no Java plugin is present,” he explains.
“But there is a way to enable Java, Silverlight etc NPAPI plugins in Firefox 52 using an about:config setting. Add new Boolean string "plugin.load_flash_only" and set it to false. Then restart the browser.”
That’s it; assuming your NPAPI plugins are installed correctly they should work as before.

http://www.omgubuntu.co.uk/2017/03/force-enable-firefox-52-npapi-support