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Thunderbird Desktop 149.0 added a way to export selected address-book cards, along with changes to Exchange Web Services (EWS) messages and Account Hub. Mozilla released it on March 24, 2026. It is now a historical release: Thunderbird 155.0 was released on September 1, 2026.
What changed in Thunderbird 149?
The official Thunderbird 149.0 release notes list three user-facing changes:
- Selected address-book cards can be exported. The notes establish that selected cards can be exported, but do not specify a file format or provide export steps.
- Starred EWS messages persist across devices. This change applies to messages accessed through Exchange Web Services.
- Address books are created in Account Hub. Account Hub is now the location for creating them.
Which bugs did Thunderbird 149 fix?
The release notes list fixes for these issues:
- Shift-clicking the Edit button in the drafts header view did not work.
- In Compose, plain text did not update until the Replace All dialog was closed.
- Using Repair text encoding could result in duplicate recipients and attachments.
- Link colors were difficult to read when using dark themes.
How do I export selected contacts in Thunderbird 149?
The release notes confirm that exporting selected address-book cards was added, but they do not document the procedure or identify the export format. They therefore are not enough to give reliable click-by-click instructions or tell you what file to expect. Consult Thunderbird’s documentation for the version you use rather than assuming a format or menu path.
Release and security timeline
| Version | Date | What the official notes say |
|---|---|---|
| 149.0 | March 24, 2026 | Introduced selected-card export and the other listed changes and fixes. Release notes |
| 149.0.1 | March 26, 2026 | The notes say there were no Thunderbird changes requiring release notes. Release notes |
| 149.0.2 | April 7, 2026 | The notes list security fixes. Release notes |
| 155.0 | September 1, 2026 | Official notes show this later release, so 149 is no longer current. Release notes |
What the Thunderbird 149 security advisory says
Mozilla rated the advisory for Thunderbird 149 as high impact. It describes, among other issues, an out-of-bounds read in IMAP parsing triggered by malformed strings from a potentially compromised mail server or connection, as well as memory-safety flaws. Mozilla says these flaws generally cannot be exploited through email because scripting is disabled when reading mail; browser or browser-like contexts may carry risk. That distinction matters: the advisory does not say that ordinary email reading alone exposes users to the same risk. See Mozilla’s Thunderbird 149 advisory and the advisory associated with Thunderbird 149.0.2.
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Thunderbird 149 system requirements
The 149.0 release page lists these minimum platform requirements:
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- Linux with GTK+ 3.14 or higher
These are the requirements stated for version 149, not a guarantee of current platform support. Check current Thunderbird documentation for support information relevant to your operating system.
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Should you install Thunderbird 149 now?
Version 149 is a past release, and its 149.0.2 update listed security fixes. If you are deciding whether to update, compare your installed version with the current supported release and consider whether your platform is supported and whether you need the address-book feature. The release pages establish that Thunderbird 155.0 followed 149, but do not provide a complete upgrade policy.
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