This bug was originally marked as duplicate of bug 210981, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE Dev (Build EaselCSS-170-on-20120514)
VM: Java HotSpot(TM) 64-Bit Server VM, 23.0-b21, Java(TM) SE Runtime Environment, 1.7.0_04-b21
OS: Mac OS X
pjiricka: Opening the WebView browser for the first time.
Maximum slowness yet reported was 5051 ms, average is 5051
Created attachment 119430 [details]
The problem is that ...webkit.debugging.api.Debugger.enable() is waiting for something in EDT.
(not sure where to reassign, so pls feel free to pass over to somewhere else)
All debugging protocol calls are now run outside of AWT. This should just work now.