Java applets don't work on Mac OS X

All webpages that use Java applets show a "Missing Plug-in" error message. Safari & Firefox both don't work.
1 answer

Manually install the Java Runtime Environment

On October 16, 2012 Apple has started to disable Java applets in Mac OS X 10.6, 10.7 and 10.8:
https://support.apple.com/kb/DL1572
https://support.apple.com/kb/DL1573

If you installed any maintenance updates for Mac OS X after that date, Java applets won't work.

You have to download and install the Java Runtime Environment yourself from
https://www.java.com/en/

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