Use-after-free vulnerability in the SetBreaks function in Mozilla
Firefox before 38.0, Firefox ESR 31.x before 31.7, and Thunderbird
before 31.7 allows remote attackers to execute arbitrary code or cause
a denial of service (heap memory corruption) via a document containing
crafted text in conjunction with a Cascading Style Sheets (CSS) token
sequence containing properties related to vertical text.
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