Mozilla SJOW creates scope chains ending in outer object (MFSA 2010-59)

The XPCSafeJSObjectWrapper class in the SafeJSObjectWrapper aka SJOW implementation in Mozilla Firefox 3.6.x before 3.6.9 and Thunderbird 3.1.x before 3.1.3 does not properly restrict objects at the end of scope chains, which allows remote attackers to execute arbitrary JavaScript code with chrom...