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Turning Java plugin on or off in Firefox web browser

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Enable or Disable Java in Firefox

Beginning in Firefox version 52 released March 7, 2017, installed NPAPI plugins are no longer supported in Firefox, except for Adobe Flash. Some of the plugins that will no longer load in Firefox, even though they may be installed on your computer, include Java, Microsoft Silverlight and Adobe Acrobat.

Over the past few years, Firefox has implemented various Web APIs so that websites can do the same things they’ve always done without plugins, so you will most likely not notice any change to your browsing experience.

Older versions of Firefox:

  • Click on the Menu button in the top right corner
  • Click on "Add-Ons" - it is the option with the puzzle piece icon
  • On the left select "Plugins"
  • Find the Java plugin that you have installed - Will most likely begin with "Java(TM) Platform"
  • In the drop down menu select "Never Activate" to disable Java. Select "Always Activate" or "Ask to Activate" to enable Java


Always Activate vs. Ask to Activate

"Ask to Activate" will prompt the user with a dialog box, asking if they want to use Java, every time the browser attempts to run the Java plugin. Choosing "Always Activate" will skip this dialog box and automatically use the Java plugin whenever it is called.