Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 52.9.1. Security Fix: * Mozilla: Memory safety bugs fixed in Firefox 61, Firefox ESR 60.1, and Firefox ESR 52.9 * Mozilla: Buffer overflow using computed size of canvas element * Mozilla: Use-after-free using focus * Mozilla: Integer overflow in SSSE3 scaler * Mozilla: Use-after-free when ...