Knowledgebase: Advisories
Advisory (02/10/2017): Java Applet Support discontinued by Firefox
Posted by Aly Essa, Last modified by Aly Essa on 18 September 2020 09:47 AM


In October of 2015, Mozilla had issued an advisory where Firefox Development intends to remove support for most NPAPI plugins by the end of 2016. (NPAPI Plugins in Firefox)

A post on Slashdot confirmed this news earlier this week: 

"Starting March 7, when Mozilla is scheduled to release Firefox 52, all plugins built on the old NPAPI technology will stop working in Firefox, except for Flash, which Mozilla plans to support for a few more versions. This means technologies such as Java, Silverlight, and various audio and video codecs won't work on Firefox."

For a short period of time, enterprise customers of Firefox have the ability to subscribe to Firefox Extended Support Release which will allow them to continue in browser FileCatalyst Applet usage. Please visit the Firefox ESR Webpage for more details.

For FileCatalyst users, this means that right now you are going to be unable to run our Java applets, as well as everyone else, in your Firefox browsers. 


Mozilla Firefox v52 and later for all Operating Systems.


FileCatalyst TransferAgent was released in March 2015 as an alternative solution to Java Applets running in Chrome and Firefox. We strongly recommend our users migrate to this application and if you would like more information on deployment and usage of TransferAgent please contact your FileCatalyst Sales Representative or submit a ticket in our FileCatalyst Support Portal.

As of February 2017, the only web browsers that support Java Applets are:

  • Safari
  • Internet Explorer v10 and later.