Security update for MozillaThunderbird (important)

This update for MozillaThunderbird fixes the following issues: Thunderbird 63 ESR was updated to version 60.3.0 to fix the following issues bsc1112852: Security issues fixed MFSA 2018-28: - CVE-2018-12389: Fixed memory safety bugs. - CVE-2018-12390: Fixed memory safety bugs. - CVE-2018-12391: Fix...