java plugin not listed in firefox(37.0.2) fedora 21(64 bit) os

In case you need to run java applet (java plugin) on firefox browser, you need to link the libnpjp2.so to the firefox plugins folder. If you have done that, but it not listed in the plugin list of the firefox. Try to following the below steps:

Check firefox version with command : firefox -v

Mozilla Firefox 37.0.2libnpjp2

Check fedora os information with command uname -a

Linux longnguyen-laptop 3.19.5-200.fc21.x86_64 #1 SMP Mon Apr 20 19:51:56 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

issues: (duplicated from the beginning sentence)

Java plugin is not listed in plugins list (about:plugins) even you have link the libnpjp2.so to /usr/lib64/mozilla/plugins wtih the command

sudo ln -s /usr/java/default/lib/amd64/libnpjp2.so /usr/lib64/mozilla/plugins/

Solutions:  start firefox with this command

firefox -P , delete the old profile, and create a new fresh profile

start firefox with profile selection
start firefox with profile selection

then, check the plugins again (in firefox url typed “about:plugins”)

firefox java plugins
firefox java plugins