A DESCRIPTION OF THE REQUEST :
When using deployJava.js to check the version of Java, Firefox 24 and above (tested on Firefox 26) shows a warning message:
"Activate Java Deployment Toolkit. This plugin has known vulnerabilities".

The reason is documented here: https://addons.mozilla.org/en-US/firefox/blocked/p428
 Why was it blocked?
The Java Deployment Toolkit plugin is known to be insecure and is unnecessary in most cases. Users should keep it disabled unless strictly necessary.

JUSTIFICATION :
The use of the Deployment Tookit plugin is not necessary in Firefox because the Java version may be successfully detected using the object window.mimeTypes by deployJava.js.

The warning message has a negative impact on the user experience.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When checking the installed Java version, the warning question "Activate Java Deployment Toolkit. This plugin has known vulnerabilities" should not appear in Firefox.

CUSTOMER SUBMITTED WORKAROUND :
in deployJava.js, change the allowPlugin method by:

    allowPlugin: function() {
        this.getBrowser();
        var ret = ('Safari' != this.browserName2 &&
            'Opera' != this.browserName2 &&
                     // Firefox added in the list of exceptions
'Firefox' != this.browserName2);
        return ret;
    },