Open the Tools option and click on Add-Ons. Find Plugins in the Add-ons manager window. For Windows click on Java (TM) Platform plugin and for Mac OS Select Java Applet Plug-in. You would find an Enable radio button if on the older version of Firefox.

Install Java Plugin Firefox Linux

Up until yesterday I've been using Firefox ESR 52.1.0 (64-bit) in order to access a VPN I need for work, which requires a Java plugin. I'm also running Firefox Developer Edition 54.0a2 (2017-04-20) (64-bit).Yesterday I updated Java to 'Version 8 Update 131 (build 1.8.0_131-b11)', and I can longer use Java plugins on any version of Firefox, which means I can no longer access the VPN.

Bug report submitted to Apple (rdar://10444452) Latest Java updates access plugin instance after destruction, crash FF 8 As of Apple's latest Java updates (Java for Mac OS 10.6 Update 6 and Java for Mac OS X Lion Update 1), Apple's Java plugin can call an NPAPI function on a plugin instance after the plugin instance has been destroyed.
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It was my understanding that The ESR versions of Firefox would continue to support Java through into 2018, but this has not been my experience.

Are there any specific issues with these versions of Firefox that prevent Java Plugins from working, or is this an issue with that version of Java itself?

Firefox Mac Os X Download

Install Java Plugin Firefox Mac Os X Download

Thanks!