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how do I change security settings

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I have an error message that reads: Application Blocked. Your security settings have blocked an untrusted application from running.

I have an error message that reads: Application Blocked. Your security settings have blocked an untrusted application from running.

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hello chrisclowers, this message isn't coming from firefox but from the java plugin - please refer to oracle's documentation: http://www.java.com/en/download/help/appsecuritydialogs.xml