Installing the Oracle Java 7 plugin in Firefox on Ubuntu 12.04

We are briefly describing here how to install the Java plugin for Oracle JDK/SE 7 in Firefox. This is a manual procedure, and in this case we are wanting to install the plugin for Java 7 update 10 to enable running of JavaFX apps in Firefox 17.01 on Ubuntu 12.04 x86.

Assuming we are using the full Oracle JDK and have installed it to /opt, then the Firefox/browser plugin is located at at /opt/jdk1.7.0_06/jre/lib/i386, and is the file named libnpjp2.so:

davek@mymachine:/opt/jdk1.7.0_06/jre/lib/i386$ pwd
/opt/jdk1.7.0_06/jre/lib/i386
davek@mymachine:/opt/jdk1.7.0_06/jre/lib/i386$ ls -al libnpjp2.so 
-rwxr-xr-x 1 root root 169420 2012-08-10 15:20 libnpjp2.so

At /usr/lib/firefox/plugins create a symbolic link to this file:

davek@mymachine:/usr/lib/firefox/plugins$ pwd
/usr/lib/firefox/plugins
davek@mymachine:/usr/lib/firefox/plugins$ sudo ln -s /opt/jdk1.7.0_06/jre/lib/i386/libnpjp2.so .
davek@mymachine:/usr/lib/firefox/plugins$ ls -al
total 8
drwxr-xr-x 2 root root 4096 2012-08-15 22:19 .
drwxr-xr-x 6 root root 4096 2012-05-03 00:09 ..
lrwxrwxrwx 1 root root   41 2012-08-15 22:19 libnpjp2.so -> /opt/jdk1.7.0_06/jre/lib/i386/libnpjp2.so

After restarting Firefox, the Java plugin should now be available (and can be enabled and disabled accordingly):

Java plugin in Firefox.

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