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History tab is missing for JSON files (the same as issue as bug #200427). Product Version: NetBeans IDE Dev (Build 201203030400) Java: 1.7.0; Java HotSpot(TM) 64-Bit Server VM 21.0-b17 System: Linux version 2.6.38-13-generic running on amd64; UTF-8; en_US (nb)
works now in trunk Product Version: NetBeans IDE Dev (Build 201207220002) Java: 1.7.0_06-ea; Java HotSpot(TM) Client VM 23.2-b08 System: Linux version 3.0.0-21-generic-pae running on i386; UTF-8; en_US (nb)
So closing as fixed.