If, when starting Firefox, you get the message "Firefox has determined that the following add-ons are known to cause stability or security problems" and the Java Deployment Toolkit plugin is listed as Blocked, this article will explain why that's happened and what you can do about it. = Keeping your computer safe = Old versions of the [http://java.com/en/download/faq/deployment_toolkit.xml Java Deployment Tookit] plugin have been found to be insecure and have been used by malicious websites to install viruses and other malware on computers. To keep your computer safe we have blocked these old and insecure versions of the plugin from running. See the [[Add-ons Blocklist]] article for more information explaining how Mozilla blocks unsafe plugins and extensions. '''You don't need to take any further action to keep your computer safe from this threat.''' = Updating your Java plugin = Java 6 Update 20 (or above) includes an updated version of the Java Deployment Toolkit plugin and other security fixes. Updating Java will allow you to safely continue running Java applications in Firefox. You can check your Java version by visiting the [http://www.mozilla.com/plugincheck/ Mozilla Plugin Check page]. You can download the latest version of Java here: [http://www.java.com/getjava/]

If, when starting Firefox, you get the message "Firefox has determined that the following add-ons are known to cause stability or security problems" and the Java Deployment Toolkit plugin is listed as Blocked, this article will explain why that's happened and what you can do about it.

Keeping your computer safe

Old versions of the Java Deployment Tookit plugin have been found to be insecure and have been used by malicious websites to install viruses and other malware on computers. To keep your computer safe we have blocked these old and insecure versions of the plugin from running. See the Add-ons that cause stability or security issues are put on a blocklist article for more information explaining how Mozilla blocks unsafe plugins and extensions. You don't need to take any further action to keep your computer safe from this threat.

Updating your Java plugin

Java 6 Update 20 (or above) includes an updated version of the Java Deployment Toolkit plugin and other security fixes. Updating Java will allow you to safely continue running Java applications in Firefox. You can check your Java version by visiting the Mozilla Plugin Check page. You can download the latest version of Java here: http://www.java.com/getjava/