De Mozilla Foundation heeft versie 139.0 van Thunderbird uitgebracht. Thunderbird is een opensourceclient voor e-mail en nieuwsgroepen met ondersteuning voor verschillende mail- en newsaccounts. Verder zijn er een spamfilter, spellingscontrole, kalender en adresboek, en heeft het een aanpasbaar uiterlijk. Thunderbird is beschikbaar in twee verschillende versies, die beide als stabiel worden aangeduid. De eerste wordt vaker voorzien van nieuwe functionaliteit en wordt als Release-versie aangeboden; de andere, de Extra Support Release-versie, wordt alleen van bugfixes en stabiliteitsverbeteringen voorzien. In deze uitgave zijn de volgende veranderingen en verbeteringen aangebracht:
What’s NewWhat’s Fixed
- Implemented enterprise policy to allow granular in-app notification control
- Added 'Mark as Read' and 'Delete' actions to mail notifications
- Implemented customizable row count for Cards View in 'Appearance' settings
- Implemented ability to manually sort folders in the folder pane
- Thunderbird could crash when setting message compose headers
- Links in the OAuth authentication window did not open when clicked
- Access was not allowed to attachments at specific UNC hosts
- Mail window could stop functioning during and after folder compaction
- Full folder sorting logic was not used when inserting folders after move
- mail.compose.other.header headers were not shown in Show All Headers mode
- Folder was hidden from Favorite when a subfolder was removed
- Folder tree message counts displayed incorrectly under certain conditions
- Selection was not restored after manual folder sorting
- Dragging a folder to a new parent did not insert it correctly for IMAP folders
- Compact View users had all folders expanded after restart
- Invite attachments without a name were forwarded as 'Attached Message Part'
- Chat settings tab remained visible when mail.chat.enabled was false
- Selected folder was not refreshed when applying 'Appearance' Threading settings
- 'Grouped by Sort' for all folders in 'Appearance' settings did not work properly
- Thunderbird could crash if message copying to Sent folder was interrupted
- System search toggle did not properly reflect and control integration state
- Dragging attachments to desktop from Thunderbird did not work on macOS
- Dark mode messages displayed in light mode due to preference setting conflict
- Cancelling a post to a news server could fail and remove the article
- Thunderbird could crash in NNTP subscription dialog
- Newsgroup searches with slashes were not supported with XPAT-enabled servers
- Offline newsgroup use lacked functionality needed for effective offline access
- Chat accounts could not be deleted
- Reminders missed for all-day events when calendar.alarms.showmissed was false
- Access to multiple CalDAV calendars was not possible
- Visual and UX improvements
- Security fixes