I know java npapi plugin is discontinued both by firefox and chrome, but I really need java to work.
So, installed Mozilla Build of Firefox, and kept it on a earlier version (51.0.1). Java has been working as expected. Java is Oracle java (Java(TM) Plug-in 11.131.2), with libnpjp2.so symlinked the usual way for many years;
Last week I updated to the new stable kernel 4.10.0-24 (no changes made to any configs) and the Java plugin just refuses to work.
If I boot with the previous kernel 4.10.0-22, the plugin works fine.
I cannot see any errors anywhere, although i was running firefox from konsole and looking at the output there.