Use-after-free vulnerability in the
nsOverflowContinuationTracker::Finish function in Mozilla Firefox
before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before
17.0.3, Thunderbird ESR 17.x before 17.0.3, and SeaMonkey before 2.16
allows remote attackers to execute arbitrary code or cause a denial of
service (heap memory corruption) via a crafted document that uses
Cascading Style Sheets (CSS) -moz-column-* properties.
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