What’s New new OpenPGP key properties can print debug information to the Error Console new External browser login flow enabled for Yandex new Custom OAuth support for issuer ID and client secret field for IMAP and POP3 new Custom OAuth support for POP3 new Enterprise policy DisableUpdateSettings prevents users from changing update settings new Enterprise policy DisableDataCollectionSettings prevents users from changing data collection setting new Enterprise policy DisableMessageForwardingFilters prevents message filters from automatically forwarding messages What’s Changed changed Preference mail.offer_experimental_features renamed to mail.experimental_features_settings.enabled changed Thundermail built-in add-on updated to v2.0.11 What’s Fixed fixed Detached attachment links were truncated when folder path contained & fixed Opening a PDF attachment in a tab displayed empty tab fixed POP3 folders with names over 55 characters could become duplicated after upgrading fixed Folders with invalid filename characters could show hashed names if cache was lost fixed Save All, Detach All, and Delete All failed after deleting one attachment fixed Renaming folders could reset folder settings fixed Subscribing an IMAP folder and subfolder together failed to subscribe the subfolder fixed Some newly fetched POP messages were not marked with new star after startup fixed Sorting after deleting the only child message removed the parent from view fixed OpenPGP signing failed with external GnuPG when the primary key could not sign fixed Remote content could load in encrypted messages opened from files fixed Sent message with expired S/MIME certificate wrongly showed untrusted CA warning fixed PDF attachments from compose windows could wrongly be detected as HTML fixed Saving unconfirmed recipients could create invalid address pills with >> fixed External browser OAuth failed when a browser preconnection closed first fixed Users could not set up custom OAuth for Exchange accounts fixed Pressing Enter on Windows system tray icon did not restore Thunderbird window fixed Inline attachments incorrectly changed the message channel content type fixed Message loading was slow while discovering large numbers of IMAP folders fixed SMTP authentication failed when usernames contained non-ASCII characters fixed Unsupported EWS archive folder prevented all mailbox folders from syncing fixed Manual Get Messages failed after startup until toggling offline mode fixed Case differences in CalDAV email addresses caused duplicate invitations fixed Accepted CalDAV invitations could be saved to the wrong calendar fixed Visual and UX improvements fixed Security fixes