Troubleshooting applications running on Firefox using the Java plugin

Official Content

How do I enable Java on Firefox?

  • Open the Firefox browser
  • From the Firefox menu, select Tools and click on the Add-ons option
  • In the Add-ons Manager window, select Plugins
  • Click Java (TM) Platform plugin (Windows) or Java Applet Plug-in (Mac OS X) to select it
  • Check that the option selected is Ask to Activate or Always Activate. In older Firefox versions, click on the Enable button (if the button says Disable, Java is already enabled).

What happens if Java is disabled?

When the Java plugin is disabled in Firefox, the following message is displayed:

FF Java plugin disabled control

Go through Manage plugins, or check whether the Java plugin is disabled by clicking on the Add-ons Manager window, and selecting Plugins: Java (TM) Platform plugin. 

FF Java SE disabled

Then, enable the Java plugin to prevent the error message from being displayed on the browser:

FF Java SE enabled

What happens if Java is outdated?

The following messages can be displayed if Firefox detects that the Java plugin version is out of date. Click on "Continue Allowing" to continue running it without updating the Java version.

FF Java out of date message


What happens if the end user blocks the Java plugin for this site?

When Firefox blocks a plugin, the user will see a similar message - the only way to see the message is by clicking on the red (or gray) icon to the left of the address bar. 

FF Java out of date message 2

FF  Java out of date message 3

The user should click on "Allow and Remember" to continue running it. Next, the following dialog will be displayed:

FF Java out of date message 4

By selecting the "Later" option, the execution continues.

Additional information

Why do I have to click to activate plugins?

Keywords: Java is disabled. Manage plugins, Your Java version is out of date, Java has prevented the outdated plugin "Java" from running, Outdated Java plugin