If it is the installation of OPENJDK, it is regrettable that it is not libnpjp2.so.
At this time according to various strange methods on the Internet are not valid, but you can use the IcedTea plugin to solve the problem.
The IcedTea version is related to the OPENJDK version of the native installation, and the general Default-java-plugin is automatically selected:
1 sudo Install Default-java-plugin
The following information is displayed (Intercept section):
The following NEW packages'll be installed: default-java-plugin icedtea-8-plugin icedtea-netx Icedtea-netx-common
If IcedTea is not selected, you will need to manually select the installation or Apt-get update.
Make sure that after the installation is complete, and then use Firefox to open the Web page with the Java plugin call, the IcedTea plugin will be called. such as: http://www.java.com/en/download/installed8.jsp, click "Verify java Version", Firefox will prompt to allow the loading of IcedTea plug-ins, Allows the IcedTea interface to be displayed once again allowing the version of the installed Java (OPENJRE) to be displayed on the Web page after the operation.
Verify the Java version page
The IcedTea Logo is displayed when the applet is called.
Here the browser will prompt to allow the IcedTea plugin to run
Applet Authorization Interface
Verify success, version number is the version number of the host currently installed OPENJRE
Referrence:
Java-community Help Wiki
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Solve the problem of Ubuntu firefox+openjdk without Java plugin