# Thunderbird changelog

> The free desktop email client from the Mozilla family, with calendar and chat built in.

- Vendor: MZLA Technologies
- Category: Communication
- Platforms: Desktop
- Official site: https://www.thunderbird.net
- Tracked by: What's New (https://whatsnew.fyi/product/thunderbird)
- Harvested from: Blog (https://www.thunderbird.net/en-US/thunderbird/releases/atom.xml)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

## Releases

### Thunderbird 153.0.1

- Date: 2026-07-28
- Original notes: https://www.thunderbird.net/en-US/thunderbird/153.0.1/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-153.0.1-rel
- Labels: Platforms: Desktop

Fixed New Message and New Event buttons were unreadable in right-to-left locales OpenPGP sending failed when an accepted key lacked a valid encryption subkey As always, you’re encouraged to tell us wh…

- **fixed** — New Message and New Event buttons were unreadable in right-to-left locales
- **fixed** — OpenPGP sending failed when an accepted key lacked a valid encryption subkey

### Thunderbird 153.0.1esr

- Date: 2026-07-23
- Original notes: https://www.thunderbird.net/en-US/thunderbird/153.0.1esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-153.0.1esr
- Labels: Platforms: Desktop

Changed There are no Thunderbird changes requiring release notes in this release As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p { display: inlin…

### Thunderbird 140.13.0esr

- Date: 2026-07-22
- Original notes: https://www.thunderbird.net/en-US/thunderbird/140.13.0esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-140.13.0esr
- Labels: Platforms: Desktop

Fixed Security fixes As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p { display: inline; }

- **security** — Fixed security issues

### Thunderbird 153.0esr

- Date: 2026-07-22
- Original notes: https://www.thunderbird.net/en-US/thunderbird/153.0esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-153.0esr-re
- Labels: Platforms: Desktop

What’s New Visual signatures can be added to PDF attachments opened in Thunderbird 'Copy Message Link' and 'Copy News Link' added to header pane 'More actions' Accessiblity is improved in various tree…

- **added** — Visual signatures can be added to PDF attachments opened in Thunderbird
- **added** — 'Copy Message Link' and 'Copy News Link' options added to header pane 'More actions'
- **changed** — Accessibility is improved in various tree components

### Thunderbird 153.0

- Date: 2026-07-21
- Original notes: https://www.thunderbird.net/en-US/thunderbird/153.0/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-153.0-relea
- Labels: Platforms: Desktop

What’s New Unified folders now display account color indicator with account name tooltip OAuth login for mail accounts now opens in default web browser Thundermail services can now be used without ins…

- **added** — Unified folders now display account color indicator with account name tooltip
- **changed** — OAuth login for mail accounts now opens in default web browser
- **added** — Thundermail services can now be used without installation

### Thunderbird 152.0.1

- Date: 2026-07-01
- Original notes: https://www.thunderbird.net/en-US/thunderbird/152.0.1/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-152.0.1-rel
- Labels: Platforms: Desktop

Fixed Reply All button was missing for some EWS messages with multiple recipients Security fixes As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p…

- **fixed** — Reply All button was missing for some EWS messages with multiple recipients
- **security** — Security fixes

### Thunderbird 140.12.1esr

- Date: 2026-06-30
- Original notes: https://www.thunderbird.net/en-US/thunderbird/140.12.1esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-140.12.1esr
- Labels: Platforms: Desktop

Fixed Security fixes As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p { display: inline; }

- **security** — Fixed security vulnerabilities

### Thunderbird 152.0

- Date: 2026-06-16
- Original notes: https://www.thunderbird.net/en-US/thunderbird/152.0/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-152.0-relea
- Labels: Platforms: Desktop

What’s New SecurityDevices enabled in enterprise policies One-click account setup for Thundermail accounts Changed Use 'Add' instead of 'New' for account, calendar, address book creation buttons GMail…

- **added** — Devices can be enabled in enterprise policies
- **added** — One-click account setup for Thundermail accounts
- **changed** — Use 'Add' instead of 'New' for account, calendar, and address book creation buttons

### Thunderbird 140.12.0esr

- Date: 2026-06-16
- Original notes: https://www.thunderbird.net/en-US/thunderbird/140.12.0esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-140.12.0esr
- Labels: Platforms: Desktop

Fixed Security fixes As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p { display: inline; }

- **security** — Fixed security vulnerabilities

### Thunderbird 140.11.1esr

- Date: 2026-05-26
- Original notes: https://www.thunderbird.net/en-US/thunderbird/140.11.1esr/releasenotes/
- Permalink: https://whatsnew.fyi/product/thunderbird/releases/feed-https-www.thunderbird.net-en-us-thunderbird-140.11.1esr
- Labels: Platforms: Desktop

Changed There are no Thunderbird changes requiring release notes in this release As always, you’re encouraged to tell us what you think , ask for help , or file a bug in Bugzilla li p { display: inlin…