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There is no jMaki plugin available with m1 build of NB 6.5. It used to be under available plug-in options in netbeans 6.1. I don't see it installed with default netbeans installtion either. I could only find this category related to Ajax so filing this issue under javascript.
Support for jMaki has been scaled back for 6.5 thus lowering priority to P3. We will try to make it available at 6.5 FCS if no serious issues are encountered.
Apparently the jMaki plugin no longer works on NB 6.5. The best approach for restoring the jMaki plugin is to work with the community site on java.net. There is no owner on the NetBeans side to take over this task. https://ajax.dev.java.net/