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Hi, NetBeans already can edit CSS, JavaScript, XML. It would be lovely if it was integrated to a support of XUL, https://developer.mozilla.org/en/Mozilla_Application_Framework_in_Detail , with a code completion as a main feature.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss