MRJPluginCarbon for Mac

From Mozilla:

This plugin enables current Mozilla-based browsers on Mac OS X to use Apple's JVM to run Applets. This first release runs on Mac OS X v10.1 and later and only works with CFM-based carbonized versions of Mozilla. All released versions of Netscape 6 and Mozilla can run the Java plugin directly, so there is no need to alter your HTML content to run applets. Features such as LiveConnect (calling Java from JavaScript) are supported.

The plugin uses the standard Applet security model provided by Apple's JVM. Remote applets can only open sockets with the server they come from, and only local applets can access the file system. There is no support for the Netscape security model, nor for signed applets, except through normal JDK security mechanisms. This version is the first release on CNET Download.com.