Firefox 11 is disabling Java plugin versions that are below version Update 31 or between and for Windows computers only. Mac OS X computers. As of September, , Firefox no longer offers a version which supports NPAPI, the technology required to run Java applets. The Java Plugin for web browsers. Use these simple instructions to download and install Java (also known as Java Runtime Environment or JRE) for Windows Firefox. To enable Java content, you'll have to install an old, bit version of Firefox and then manually add the Java plugin. This is possible on. I have windows 7 32bit with Firefox v 32 bit. The latest update removed the java plugin so I uninstalled Java and reinstalled. It works fine. Up until yesterday I've been using Firefox ESR (bit) in order to access a VPN I need for work, which requires a Java plugin. I'm also. Please note the below instructions work only for Firefox browser version below Firefox has removed NPAPI plugin support, and therefore Java Plugin cannot . The bit version of Firefox does not support NPAPI plug-ins, including Java. The Java Plugin for web browsers relies on the cross-platform plugin. Is there anyway I can install manually this plug-in as I have tried reverting back to old Firefox Versions and re-install Java many times and it.