Firefox on OS X: Java not working?

Mozilla FirefoxWith recent Firefox versions (3.6, 4.0 beta), I was unable to view any kind of website that uses Java on my Mac.

Browsing through the about:plugins{.liinternal} page I found out that I had three different versions of the Java Embedding Plugin (MRJPlugin.plugin) loaded in Firefox — two of them in addition to the one that already ships with Firefox!

The additional add-ons were found in

  • /Library/Internet Plug-Ins
  • <user>/Library/Internet Plugins/

After deleting those and restarting Firefox, I was able to enjoy the beauty of Java applets again!1

  1. OK, that was a lie. But I was at least able to use the postage stamp printing application on the DHL website... []
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