The Java Embedding Plugin is a utility that allows other web browsers than Apple's Safari to use the most recent available versions of Java on Mac OS X (Java 1.4.X and, on Tiger (OS X 10.4.X), Java 1.5/J2SE 5.0 and Java SE 6). When used together with an updated version of Mozilla's MRJ Plugin Carbon (included in this distribution), the Java Embedding Plugin's functionality is currently available to recent versions of Firefox, Camino, Seamonkey and the Mozilla Suite. But in principle any web browser could use one of the Java Embedding Plugin's two APIs to add support for Java 1.4.X and (where available) Java 1.5/5.0 and Java 6.

The current versions of the Java Embedding Plugin and the MRJ Plugin JEP have been tested on OS X 10.2.8 with Java 1.4.1, on OS X 10.3.9 with Java 1.4.2_09 (Java Security Update), and on OS X 10.4.8 with Java 1.4.2_09 and Java 1.5.0_06 (J2SE 5.0 Release 4), and with Java SE 6 (Release 1 Developer Preview 6). But they should also work with versions of Apple's OS X and Java that fall between these three "milestones". Also required are recent versions of Firefox, Camino, Seamonkey or the Mozilla Suite. The following versions have been confirmed to work -- Mozilla 1.6 and 1.7.X, Firefox 0.8 through 2.0, Camino 0.7 through 1.0.3 and Seamonkey.