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Message display toolbar action WebExtension API
Navigation buttons are now available in content tabs, for example those opened via an add-on search
"New email" icon in Windows systray changed from in-tray with arrow to envelope
Icons of attachments in the attachment pane of the Write window not always correct
Toolbar buttons of add-ons in the menubar not shown after startup
LDAP lookup not working when SSL was enabled. LDAP search not working when "All Address Books" was selected.
Scam link confirmation panel not working
In Write window, the Link Properties dialog wasn't showing named anchors in context menu
Calendar: Start-up failed if the application menu is not on the calendar toolbars
Chat: Account reordering via drag-and-drop not working on Instant messaging status dialog (Show Accounts)
Various security fixes
When upgrading from Thunderbird version 60 to version 68, add-ons are not automatically updated during the upgrade process. They will however be updated during the add-on update check. It is of course possible to reinstall compatible add-ons via the Add-ons Manager or via addons.thunderbird.net.