Use-after-free vulnerability in Mozilla Firefox 10.x before 10.0.1,
Thunderbird 10.x before 10.0.1, and SeaMonkey 2.7 allows remote
attackers to cause a denial of service (application crash) or possibly
execute arbitrary code via vectors that trigger failure of an
nsXBLDocumentInfo::ReadPrototypeBindings function call, related to the
cycle collector's access to a hash table containing a stale XBL
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