Issue 5442 (Hovering a CSS rule fails to show a list of matched elements) http://code.google.com/p/fbug/issues/detail?id=5442
Issue 5442 (Hovering a CSS rule fails to show a list of matched elements)
http://code.google.com/p/fbug/issues/detail?id=5442

http://code.google.com/p/fbug/source/detail?r=12949

firebug/selectbug