Java For Firefox Plugin May 2026

(external Java launch):

This allows launching a Java process, not embedding an applet. If you attempt to re-enable Java plugins via old Firefox forks (Waterfox, Pale Moon): java for firefox plugin

<script src="https://cjrtnc.leaningtech.com/3.0/cj3.js"></script> <script> cheerpjRunJar("/app/myapplet.jar"); </script> Limitations: Limited Swing/AWT support, performance overhead, license cost. Open-source Java Web Start implementation that can launch applets, but requires external window. 6. Firefox Plugin Architecture Evolution | API | Supported Versions | Java Support | Status | |-----|-------------------|--------------|--------| | NPAPI | Firefox 1–52 | Yes (until 52) | Deprecated | | PPAPI (Pepper) | Never in Firefox | No | Chrome/Chromium only | | WebExtensions | Firefox 45+ | No | Current extension API | | Native Messaging | Firefox 50+ | Partial (launch external Java) | Available | (external Java launch): This allows launching a Java