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+--- Thread: Mozilla Thunderbird 159 Email Client Improves Tray Icon Support on Linux (/showthread.php?tid=446)
Mozilla Thunderbird 159 Email Client Improves Tray Icon Support on Linux - jiaolix - October 27, 2026
Mozilla has released Thunderbird 159, the latest version of its open-source email, chat, address book, news, and calendar client, continuing its fast two-week release cycle. The update brings improved tray icon support for Linux systems, security fixes, and a range of usability improvements for users across all supported platforms.
Enhanced Linux Tray Icon and Calendar Detection
Thunderbird 159 improves tray icon support on Linux, allowing the icon to indicate unread mail and display the message count in the tooltip. The release also introduces automatic detection of Graph calendars when creating a new account, making setup easier for users who rely on Microsoft's calendar services.
Security Fixes Address Injection and Spoofing Risks
The update includes several security-related fixes. These prevent SMTP addresses with line breaks from injecting unintended commands, stop Unicode email addresses from hiding a different Reply-To destination, block remote content loading in news articles with missing message headers, and prevent RSS feeds from injecting arbitrary Message-ID and References headers.
Stability and Performance Improvements
Thunderbird 159 resolves a startup hang when restoring IMAP message and PDF tabs, fixes an issue where malformed message database files caused excessive CPU usage, and addresses a problem where large ICS calendar files exhausted memory and froze the application. The release also fixes EWS and Graph accounts failing when outgoing server settings are incomplete.
UI and Workflow Refinements
Several interface issues have been corrected. The Zoom Text Only option in the View menu now works properly, the first Wrap Long Lines toggle in View Source no longer does nothing, and the Search Messages menu option is no longer enabled but non-functional for saved search folders. The Quick Find shortcut (/) no longer requires Ctrl+F to have been used first.
Additional fixes include the View > Folders option now working correctly in Calendar and Tasks tabs, global search results displaying recipients in the To field, the first message filter condition being removable when others exist, and canceling the print dialog no longer printing multiple copies of a message.
Attachment and Message Handling Fixes
The Save All and Detach All options no longer fail for attachments with invalid filename paths. Forwarding malformed MIME messages no longer omits attachments, MP4 attachments are no longer truncated when forwarding, and inline images no longer disappear when editing local or POP messages as new.
Thunderbird 159 also fixes the Retry and Save Locally options after a sent-folder copy error, the Account Hub Edit Configuration option for Exchange and Graph accounts, and closing of unmodified compose windows no longer prompting users to save when using Body Text.
IMAP, POP3, and Sync Corrections
The release addresses non-ASCII IMAP tags exceeding server length limits and getting rejected, IMAP namespace root folders being inaccessible due to duplicated folder names, and newsgroups with UTF-8 names displaying duplicate or incorrect messages. POP3 NTLM authentication no longer fails due to the password being sent incorrectly, POP3 sessions no longer remain active after canceling the password prompt, address book sync no longer stops when the server rejects an invalid sync token, and CalDAV passwords now save to avoid repeated login prompts after a restart.
Availability and Email Account Options
Thunderbird 159 is available for download from the official website as binaries for Linux, macOS, and Windows systems. Linux users can also install it from their distribution's repositories or from Flathub. For users managing multiple email services alongside Thunderbird, platforms like z2u.com offer a convenient way to explore Email Account options, including Outlook Accounts and Yahoo Mail Accounts, for testing, development, or personal use.