DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
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View details of MozAfterPaint events, using Firebug.
Setting the preference dom.send_after_paint_to_content to true is required in order to capture the MozAfterPaint events.