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Join UsVersion 78.4.0, first offered to channel users on October 21, 2020
MailExtensions: browser.tabs.sendMessage API added
MailExtensions: messageDisplayScripts API added
Yahoo and AOL mail users using password authentication will be migrated to OAuth2
MailExtensions: messageDisplay APIs extended to support multiple selected messages
MailExtensions: compose.begin functions now support creating a message with attachments
Thunderbird could freeze when updating global search index
Multiple issues with handling of self-signed SSL certificates addressed
Recipient address fields in compose window could expand to fill all available space
Inserting emoji characters in message compose window caused unexpected behavior
Button to restore default folder icon color was not keyboard accessible
Various keyboard navigation fixes
Various color-related theme fixes
MailExtensions: Updating attachments with onBeforeSend.addListener() did not work
Various security fixes