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Issue 37943 records that "customization" is done in very inconsistent ways in the IDE. After reviewing the different uses, the HIE group concluded that the idea of "customize" isn't adding any value (existing uses of "Customize" can be done in other ways), and may actually be confusing users since "customization" is not consistenly done in the interface. At the moment, it seems like almost all tag library editing is done with customizers in the Filesystems view. It would be very desirable to move this functionality into the source editor portion of the IDE and allow people to do all tag library editing there. This would be consistent with new trends in the IDE's interface, and would remove the notion of "customization" as a means of creating tag libraries.
BTW: old style taglib editor was removed in 4.0.
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