changed: Thunderbird now only shows quota exceeded
indications on the main window (bmo#1671748)
changed: MailExtensions: menus API enabled in messages being
composed (bmo#1670832)
changed: MailExtensions: Honor allowScriptsToClose argument
in windows.create API function (bmo#1675940)
changed: MailExtensions: APIs that returned an accountId will
reflect the account the message belongs to, not what is
stored in message headers (bmo#1644032)
fixed: Keyboard shortcut for toggling message 'read' status
not shown in menus (bmo#1619248)
fixed: OpenPGP: After importing a secret key, Key Manager
displayed properties of the wrong key (bmo#1667054)
fixed: OpenPGP: Discovering keys online via Key Manager
sometimes failed on Linux (bmo#1634053)
fixed: OpenPGP: Encrypted attachment 'Decrypt and Open/Save
As' did not work (bmo#1663169)
fixed: OpenPGP: Importing keys failed on macOS (bmo#1680757)
fixed: OpenPGP: Verification of clear signed UTF-8 text
failed (bmo#1679756)
fixed: Address book: Some columns incorrectly displayed no
data (bmo#1631201)
fixed: Address book: The address book view did not update
after changing the name format in the menu (bmo#1678555)
fixed: Calendar: Could not import an ICS file into a CalDAV
calendar (bmo#1652984)
fixed: Calendar: Two 'Home' calendars were visible on a new
profile (bmo#1656782)
fixed: Calendar: Dark theme was incomplete on Linux
(bmo#1655543)
fixed: Dark theme did not apply to new mail notification
popups (bmo#1681083)
fixed: Folder icon, message list, and contact side bar visual
improvements (bmo#1679436)
fixed: MailExtensions: HTTP refresh in browser content tabs
did not work (bmo#1667774)
fixed: MailExtensions: messageDisplayScripts failed to run in
main window (bmo#1674932)
fixed: Various security fixes
MFSA 2020-56 (bsc#1180039)
CVE-2020-16042 (bmo#1679003)
Operations on a BigInt could have caused uninitialized memory
to be exposed
CVE-2020-26971 (bmo#1663466)
Heap buffer overflow in WebGL
CVE-2020-26973 (bmo#1680084)
CSS Sanitizer performed incorrect sanitization
CVE-2020-26974 (bmo#1681022)
Incorrect cast of StyleGenericFlexBasis resulted in a heap
use-after-free
CVE-2020-26978 (bmo#1677047)
Internal network hosts could have been probed by a malicious
webpage
CVE-2020-35111 (bmo#1657916)
The proxy.onRequest API did not catch view-source URLs
CVE-2020-35112 (bmo#1661365)
Opening an extension-less download may have inadvertently
launched an executable instead
CVE-2020-35113 (bmo#1664831, bmo#1673589)
Memory safety bugs fixed in Thunderbird 78.6
Mozilla Thunderbird 78.5.1
new: OpenPGP: Added option to disable email subject
encryption (bmo#1666073)
changed: OpenPGP public key import now supports multi-file
selection and bulk accepting imported keys (bmo#1665145)
changed: MailExtensions: getComposeDetails will wait for
'compose-editor-ready' event (bmo#1675012)
fixed: New mail icon was not removed from the system tray at
shutdown (bmo#1664586)
fixed: 'Place replies in the folder of the message being
replied to' did not work when using 'Reply to List'
(bmo#522450)
fixed: Thunderbird did not honor the 'Run search on server'
option when searching messages (bmo#546925)
fixed: Highlight color for folders with unread messages
wasn't visible in dark theme (bmo#1676697)
fixed: OpenPGP: Key were missing from Key Manager
(bmo#1674521)
fixed: OpenPGP: Option to import keys from clipboard always
disabled (bmo#1676842)
fixed: The 'Link' button on the large attachments info bar
failed to open up Filelink section in Options if the user had
not yet configured Filelink (bmo#1677647)
fixed: Address book: Printing members of a mailing list
resulted in incorrect output (bmo#1676859)
fixed: Unable to connect to LDAP servers configured with a
self-signed SSL certificate (bmo#1659947)
fixed: Autoconfig via LDAP did not work as expected
(bmo#1662433)
fixed: Calendar: Pressing Ctrl-Enter in the new event dialog
would create duplicate events (bmo#1668478)
fixed: Various security fixes
MFSA 2020-53 (bsc#1179530)
* CVE-2020-26970 (bmo#1677338)
Stack overflow due to incorrect parsing of SMTP server
response codes