This update for MozillaThunderbird fixes the following issues:

Mozilla Thunderbird 68.9.0 (bsc#1172402)

- CVE-2020-12405: Fixed a use-after-free in SharedWorkerService.
- CVE-2020-12406: Fixed a JavaScript Type confusion with NativeTypes.
- CVE-2020-12410: Fixed multiple memory safety issues
- CVE-2020-12398: Fixed a potential information leak due to security downgrade
with IMAP STARTTLS
- Use a symbolic icon from branding internals

This update was imported from the SUSE:SLE-15:Update update project.