De Mozilla Foundation heeft versie 138.0 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 verbeteringen aangebracht:
What’s NewWhat’s Changed
- New mail alert now includes message disposition buttons
- New mail notification customization added to macOS Settings
What’s Fixed
- Changed color override defaults with high contrast mode on macOS and Linux
- macOS notifications displayed two logos
- Message preview truncation in notifications improved
- Wrong day of week displayed for some emails
- In dark mode with light theme, message reader still displayed in dark mode
- Message link and text colors were incorrect when using Dark Reader
- Unchecking "Show all headers" in Message Header Settings closed dialog
- Address book did not match users when case differed in some instances
- Menu items to manage folders were not disabled in offline mode
- Using Delete column in "Search Messages..." window could delete other messages
- Ctrl or Shift selecting multiple messages reset when dragging across a message
- Newsgroups could no longer be re-ordered in the folder tree via drag and drop
- Windows users with non-ASCII folder names and profile paths could not view emails
- OpenPGP key was not updated when accepted key was reimported with new identities
- Dual signed (PGP and S/MIME) emails were not displayed
- Notification duration preference enabled when system notifications were enabled
- Thunderbird could crash when adaptive message filtering was enabled
- CardDAV synchronization to Zimbra server failed
- Keyboard navigation was not possible when first header button was disabled
- Folders missing from view when "Show only subscribed folders" was not selected
- Nickserv messages appeared during successful authentication
- Global indexing failed when processing email with invalid calendar data
- Clicking a mid: link in Calendar opened two copies of the message
- Some calendar requests were blocked due to opaque response blocking
- Visual and UX improvements
- Security fixes
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