mozilla: CSS reference counter overflow (ZDI-CAN-349)

Mozilla Firefox before 2.0.0.16 and 3.x before 3.0.1, Thunderbird before 2.0.0.16, and SeaMonkey before 1.1.11 use an incorrect integer data type as a CSS object reference counter in the CSSValue array aka nsCSSValue:Array data structure, which allows remote attackers to execute arbitrary code vi...