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I am using Kubuntu 10.04 with Firefox 3.6 from Mozilla's website and I use OpenJDK from the Ubuntu repsitories.

I want to know how do I configure OpenJDK with the Firefox to view Java applets in the browser.

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up vote 7 down vote accepted

Just install a package called icedtea-6-plugin (or icedtea-7-plugin for OpenJDK 7) and you should be all set.

You can verify it works correctly on this page:

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If you're using Fedora like me you need to install

sudo yum install icedtea-web

Restart your browser after this.

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