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I have installed extension called Flash Block (see [1]). This extension seems to modify DOM in a way that it inserts some <style> element between HEAD and BODY thus all DOM breakpoints references are wrong, path like html[0]/body[1] is changed to html[0]/body[2] so all breakpoints are set to "nonexisting" body element. I have no idea if this is anyway fixable as there could be other extensions that modifies DOM in other ways :/ If a brief look at [2] was correct, NetBeans plugin could have management permission and thus disable all other extensions. The problem is that if it crashes, the extensions would stay disabled. [1] https://chrome.google.com/webstore/detail/flashblock/gofhjkjmkpinhpoiabjplobcaignabnl [2] http://developer.chrome.com/extensions/management.html
Why body[2] if only some style was added?
The extra <style> is injected outside <head> and before <body>. Which is probably not by specification, but it works. But the problem is more general, this is just one example
This problem was mostly eliminated by using id attribute to locate the proper DOM element.
This is probably "fixed" now by having Browser DOM again. Since user cannot create DOM breakpoints via old Navigator, this could happen only if he/she creates DOM breakpoint "manually" which is IMO less common use case