CVE 2012-3980
The web console in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, and Thunderbird ESR 10.x before 10.0.7 allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted web site that injects this code and triggers an eval operation.
See the 
CVE page on Mitre.org
for more details.
