This update for MozillaThunderbird fixes the following issues:

Mozilla Thunderbird 78.12

* fixed: Sending an email containing HTML links with spaces in
the URL sometimes resulted in broken links
* fixed: Folder Pane display theme fixes for macOS
* fixed: Chat account settings did not always save as expected
* fixed: RSS feed subscriptions sometimes lost
* fixed: Calendar: A parsing error for alarm triggers of type
"DURATION" caused sync problems for some users
* fixed: Various security fixes

MFSA 2021-30 (bsc#1188275)

* CVE-2021-29969: IMAP server responses sent by a MITM prior to STARTTLS could be processed
* CVE-2021-29970: Use-after-free in accessibility features of a document
* CVE-2021-30547: Out of bounds write in ANGLE
* CVE-2021-29976: Memory safety bugs fixed in Thunderbird 78.12

This update was imported from the SUSE:SLE-15-SP2:Update update project.