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I've just downloaded the new FireBug 1.4.1 and NetBeans 6.7.1, and there are still problems with debugging JavaScript in NetBeans. While I can set breakpoints in NetBeans, and they will stop in the FireBug console, they are not picked up by NetBeans, so I can't step through the code in the NetBeans environment. This used to work fine prior to Firefox 3.5.
A new implementation of JavaScript debugger is in trunk. Closing old issues.