Thunderbird 157
Thunderbird 157 fixes a bug that kept a CPU core at 100%, repairs IMAP, Gmail OAuth2, Exchange NTLM, OpenPGP, and CalDAV issues, and adds DisableChat and DisableFileLink enterprise policies.
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Thunderbird 157 was released on September 30, 2026, two weeks after Thunderbird 156. We covered it in the news.
What changed
A CPU fix. The status bar could stay active after activity finished and keep a CPU core at 100%, draining laptop batteries. That is fixed.
Enterprise policies: DisableChat turns off the built-in chat, and DisableFileLink turns off FileLink, which uploads large attachments to cloud storage.
Fixes for:
- IMAP saving to Sent, and disappearing messages
- Gmail OAuth2, Exchange NTLM, and SMTP authentication
- OpenPGP rejecting valid keys
- CalDAV task syncing, invitations, and recurring event dates
- Yahoo mail display
Also new: the Thundermail add-on moves to 2.0.16, the port field is optional in manual IMAP/POP setup, and remote content can be shown in integrity-protected OpenPGP messages.
Installing
Thunderbird installed from Mozilla updates itself. Flathub and distribution packages follow shortly; Debian and Ubuntu LTS track the Extended Support Release instead.
flatpak install flathub org.mozilla.ThunderbirdVerify Your Download
Mozilla publishes signed SHA256SUMS and SHA256SUMS.asc files in each release directory.