Having trouble getting Java to work with Firefox (version 22), I have followed the advice in this question and on the official Java site, but nothing seems to work.

I have the latest Java (1.7.0_25) in /opt/java and have set a symlink in /usr/libs/mozilla/plugins for the libnpjp2.so file. I can see the file in the terminal and Java runs fine. However, Firefox shows nothing in about:plugins. I have also run

export JAVA_HOME="/opt/java/jre1.7.0_05/bin/java"

to be on the safe side. I know there are multiple plugin directories such as /usr/lib/firefox/plugins and /usr/lib/firefox-addons/plugins, but all my current plugins show they are located in /usr/lib/mozilla/plugins when viewing the about:plugins page.

Where do I go next?

I recommend you not to use a manual installation. In this case you have to manually update Java as well. There is a nice workaround with a automatic update function:

https://askubuntu.com/a/368529/153278

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