The following 5 CentOS updates are available: CESA-2012:0140 Critical CentOS 6 thunderbird Update, CESA-2012:0143 Critical CentOS 6 xulrunner Update, CESA-2012:0141 Critical CentOS 4 seamonkey Update, CESA-2012:0142 Critical CentOS 4 firefox Update, and CESA-2012:0143 Critical CentOS 5 xulrunner Update
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