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When trying to post a thread (here https://forums.netbeans.org/posting.php) I get following error You have not selected corect security task image. ('corect' was not my spelling mistake) I have found out that Firefox aswell as Chrome are blocking following script. http://netbeans.org/images_www/js/jquery.simpleCaptcha-0.2.js : this content should also be loaded over HTTPS.
fixed now, thanks for the report!