Run "Java Control Panel". Then add "http://jwork.org/" to the "Exception site list" in the Security tab. This should look as this (for Java8):
Then restart the browser.
When you look at the tutorial sections for each topic, the browser downloads the needed jar files. This will take 5 seconds depending on the network. The you will see the message:
Click "Accept" and press "Run".
See additional help:
One can test your Java settings using this Java powered link.
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