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How to turn off Java applets

Support will end for all NPAPI plugins except for Flash in March 2017, when Firefox version 52 is released. See this compatibility document and this article for details.

Beginning with Firefox version 52, support has ended for all NPAPI plugins except for Adobe Flash. See this compatibility document and this article for details.

This article explains how to disable the Java plugin in Firefox so that Java applets no longer run.

By default, Firefox prompts you to activate Java when you visit websites with Java content. However, you may decide that you do not want Java applets to run. To disable Java applets in Firefox:

  1. Click the menu button New Fx Menu and choose Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Plugins panel.
  3. Click on the Java(TM) Platform plugin Java Applet Plug-inJava plugin to select it.
  4. Select Never Activate in its drop-down menu if it's not already set.

Java applets will no longer be permitted to launch in Firefox and you will no longer be prompted to activate Java.

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Version History
Revision #:
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Last update:
3 weeks ago
Updated by:

Apple is linking to this article from the new which is where they're sending users who want to disable Java. This really old article isn't the best place for that, we should either fix it up or redirect it somewhere (don't see a better one at first glance but didn't look hard).

I'll ask an admin to take a look at this thread. In the meantime I made an update to the article but left it archived.

Thanks y'all. I just unarchived the article since that's the quickest thing to do given that Alice updated it. Not sure what the ideal solution is. Maybe we should add a links to Old versions of Java have been blocked - update and unblock Java and Use the Java plugin to view interactive content on websites. Lets see how much traffic this gets and re-evaluate.

Well this article got a lot of traffic for a short time and performed well. I was going to archive it again but it looks like there is a new Java problem that we'll be pointing users to this article for.

Related discussion thread (posted August 28, 2012):

Verdi said

There is an issue with Java (again) that currently doesn't have a solution or workaround other than disabling Java. I believe we are going to blocklist java but we are also going to publish a blog post about manually disabling java that will link to this article - How to turn off Java applets.<snip>

Verdi said

Here's that blog post that just went out

I just wanted to add that this article is also linked from US-Cert Vulnerability Note VU#636312 (in the "Disable the Java plug-in") section.

Slug is: "How to turn off Java applets"

I suggest changing the slug to: "how-to-turn-off-java-applets"

scootergrisen said

Slug is: "How to turn off Java applets" I suggest changing the slug to: "how-to-turn-off-java-applets"