Cearing disk and memory caches, restarting browser, etc does not cause Mozilla to reload a new jar file. Even waiting a day does not help, nor changing reload preferences, nor starting and stopping Java. I am using the Java 1.4 plugin. The correct, new jar file is loaded by Konqueror, and appletviewer. Mozilla 1.1 Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1) Gecko/20020826
Jeremy, This isn't a mozilla issue. The java plugin maintains a private cache of jar files and so on. The default location for this cache is a directory named ".jpi_cache" within your home directory. The java plugin comes with its own control panel app. You may find this link informative: <http://java.sun.com/j2se/1.4/docs/guide/plugin/developer_guide/control_panel.html>.