Issue 1717 (CSS Panel does not have @media UI)
http://code.google.com/p/fbug/issues/detail?id=1717
Show @-moz-document rules inside the DOM panel
Issue 5429 (Show @document rules inside CSS panel)
http://code.google.com/p/fbug/issues/detail?id=5429
Show @supports rules inside DOM panel
Issue 5912 (Show @supports rules inside CSS panel)
http://code.google.com/p/fbug/issues/detail?id=5912
CSSDocumentRule must be checked first, otherwise an exception will be
thrown
Issue 5290 (Show @keyframes rules inside CSS panel)
http://code.google.com/p/fbug/issues/detail?id=5290
Merge branch 'master' of https://github.com/firebug/firebug into issue4979