Use-after-free vulnerability in the
nsAnimationManager::BuildAnimations function in the Animation Manager
in Mozilla Firefox before 24.0, Firefox ESR 17.x before 17.0.9,
Thunderbird before 24.0, Thunderbird ESR 17.x before 17.0.9, and
SeaMonkey before 2.21 allows remote attackers to execute arbitrary
code or cause a denial of service (heap memory corruption) via vectors
involving stylesheet cloning.
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