Thunderbird Beta for Testers

Feb 25, 2026

Older Versions of Thunderbird Beta for Testers

If you are experiencing issues with the latest version of Thunderbird Beta for Testers due to bugs or incompatibility with your device, downloading an older version can be a practical solution before the app developer fixes the problem. APKPure offers all of the older versions of Thunderbird Beta for Testers that are compatible with various devices and Android systems. Download rollbacks of Thunderbird Beta for Testers for Android. All downloads from APKPure are free from viruses and provide a fast, secure way to get the app version history you need.

All Versions of Thunderbird Beta for Testers

17.0b4(45)XAPKAPKs
Feb 25, 202614.3 MBAndroid 6.0+
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What's new in the version 17.0b4
Updated on Feb 25, 2026
Thunderbird version 17.0b4

Fixed:
- Application navigation and account switching could crash
17.0b3(44)XAPKAPKs
Feb 18, 202614.3 MBAndroid 6.0+
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What's new in the version 17.0b3
Updated on Feb 18, 2026
Thunderbird version 17.0b3

Fixed:
- Application could crash when rendering message list
- Avatar image updates did not propagate immediately
17.0b2(43)XAPKAPKs
Feb 8, 202614.2 MBAndroid 6.0+
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What's new in the version 17.0b2
Updated on Feb 8, 2026
Thunderbird version 17.0b2

Fixed:
- Crash occurred in 17.0b1 split view mode while in landscape
16.0b4(41)XAPKAPKs
Jan 23, 202613.9 MBAndroid 5.0+
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What's new in the version 16.0b4
Updated on Jan 23, 2026
Thunderbird for Android version 16.0b4, based on K-9 Mail. Changes include:
- OAuth SMTP authentication failed with some Microsoft servers
16.0b3(39)XAPKAPKs
Dec 17, 202513.8 MBAndroid 5.0+
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What's new in the version 16.0b3
Updated on Dec 17, 2025
Thunderbird for Android version 16.0b3, based on K-9 Mail. Changes include:
- Application crashed on Pixel 10 Pro when returning to message list
- Account avatar monograms reverted to initial account name and could not be renamed
16.0b2(38)XAPKAPKs
Dec 12, 202513.9 MBAndroid 5.0+
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What's new in the version 16.0b2
Updated on Dec 12, 2025
Thunderbird for Android version 16.0b2, based on K-9 Mail. Changes include:
- Application crashed at startup
- Fix various edge-to-edge issues throughout the app
15.0b1(35)XAPKAPKs
Nov 20, 202524.6 MBAndroid 5.0+
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What's new in the version 15.0b1
Updated on Nov 20, 2025
Thunderbird for Android version 15.0b1, based on K-9 Mail. Changes include:
- Add avatar to message list content
- Enable in-app notifications for beta
- In-app error notification improvements
- Default sync interval changed to 15 minutes
- Warn user in compose when no sent folder detected
- Confirm when sending message without sent folder
- 'Colorize contact pictures' default changed unexpectedly from true to false
- Displaying IMAP password in did not prompt for authentication
14.0b3(34)XAPKAPKs
Oct 30, 202513.1 MBAndroid 5.0+
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What's new in the version 14.0b3
Updated on Oct 30, 2025
Thunderbird for Android version 14.0b3, based on K-9 Mail. Changes include:
- Thunderbird could crash after deleting an account
14.0b2(33)XAPKAPKs
Oct 23, 202513.1 MBAndroid 5.0+
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What's new in the version 14.0b2
Updated on Oct 23, 2025
Thunderbird for Android version 14.0b2, based on K-9 Mail. Changes include:
- Messages could not be fetched in 14.0b1
13.0b5(31)XAPKAPKs
Oct 18, 202512.5 MBAndroid 5.0+
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What's new in the version 13.0b5
Updated on Oct 18, 2025
Thunderbird for Android version 13.0b5, based on K-9 Mail. Changes include:
- Reverted word-wrapping change that broke HTML and table rendering
- Application crashed when opening placeholder folder

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