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In IE9 (only one time): Tools > Internet Options > Advanced tab > In Browsing category > Clear “Disable script debugging” check boxes (both) > restart IE.
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In VS 2012: Run the Page Inspector ( when javascript error box opens, click No ! )
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Choose from VS menu: DEBUG > Attach to process…
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Select “WebBrowserServer.exe” and click Attach
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In Page Inspector window click the Refresh icon.
Debugging works pretty well, but it’s one condition. Don’t insert any breakpoints in your code (or clear them before – DEBUG > Delete All Breakpoints). There can cause a lot of problems – from hanging and frozing to entirely crashing your VS.