Some people may experience a problem with Java applet in Mozilla Firefox 3.0. For me, I noticed that after upgrading from Firefox 2.0 to Firefox 3.0, some of my applets don't work anymore. This happens when I have network.cookie.cookieBehavior setting = 1. This will disallow access to 3rd party cookies. However, it also has a side effect where it disallow cookie from the same site when fetching for Java applet codebase as well. Changing it back to 0 (Allow all cookies" fixes it. http://kb.mozillazine.org/N...