In the next menu, choose Update & Security, and then click Troubleshoot.If your version of Firefox is 51 or older, Java can be enabled to run with it. If your version of Firefox is newer than version 51, you will need to use another browser, such as Internet Explorer or Safari. Support for Java with Firefox ended with Firefox version 51. This change does not affect Web Start applications, it only impacts Java Applets. Click Java (TM) Platform plugin (Windows) or Java Applet Plug-in (Mac OS X) to select it.įirefox no longer provides NPAPI support (technology required for Java applets) As of September, 2018, Firefox no longer offers a version which supports NPAPI, the technology required to run Java applets.In the Add-ons Manager window, select Plugins.From the Firefox menu, select Tools then click the Add-ons option.Open the Firefox browser or restart it, if it is already running.Now wait for the Java prompt to appear.Click or double-click the Firefox app icon, which resembles an orange fox around a blue globe. Method 1: Allowing Java Content on a Website When did Mozilla stop supporting Java in Firefox?.Do you need Java plugin to use Firefox?.Is there an extension to block Flash in Firefox?.How do I plug Java into my Firefox browser?.What version of Firefox works with Java?.