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Enable passing the debugging settings to the browser being launched, according to http://javapubs.us.oracle.com/people/jonathan/trouble-03/TSG-Desktop/html/plugin.html#gcexo (by setting variables _JPI_VM_OPTION, JAVAWS_VM_ARGS, ...)
Had been working for some time already but especially after the resolution of https://netbeans.org/bugzilla/show_bug.cgi?id=202990 it can be considered solved.