It's likely that a Java plugin is available from java.sun.com that is compatible your operating system. This plugin can be used within the newest Netscape browser (versions > 6) and with Mozilla. The reason for producing a plugin is that, basically, the complexity of the Java "virtual machine" has become too great for the programmers at Netscape to write their own Java interpreter. Companies that specialize in this matter will now provide Java support for various platforms. By moving the Java functionality of your browser to a plugin (supplementary coded module), it is possible to update the Java plugin without waiting for a new browser release. However, this constitutes a sort of chore or responsibility for the browser user that didn't exist over the last few years. The large number of Java applets now in use on the World Wide Web are a compelling reason to install the plugin.