I had java plugin working on Firefox 53, but I accidentally upgraded Firefox to 54. So I've gone back to the version 53 from apt-cache, recreated the symlink ~/.mozilla/plugins/libnpjp2.so but now the java applets don't work. It just says The java plugin has crashed. The only message I get is this in ~/.xsession-errors###!!! [Parent][MessageChannel::Call] Error: Channel error: cannot send/recv###!!! [Parent][MessageChannel::Call] Error: (msgtype=0x9A000C,name=PPluginInstance::Msg_NPP_GetValue_NPPVpluginScriptableNPObject) Channel error: cannot send/recvI have the applet listed in about:plugins so this part should be fine:Java(TM) Plug-in 10.79.2File: libnpjp2.soPath: /home/user/SW/jdk1.7.0_79/jre/lib/amd64/libnpjp2.soVersion: 10.79.2State: EnabledNext Generation Java Plug-in 10.79.2 for Mozilla browsers
Java plugin crashes on Firefox 53
debian;java;firefox