Thunderbird Beta for Testers icon

Thunderbird Beta for Testers

Mozilla Thunderbird
★ 4.2 (1,837 ratings)
⬇ 100,000+ downloads
Est. actual: 145,541
Free
Released: Sep 30, 2024
IAP: $5.00 - $200.00 per item
No ads
Rated: Everyone

Signals

5 this week · 3 positive All of this week's signals →
  • 📈Last 7 days +1.5K installs · 107/day since Sep 26
  • 🏆Among Communication apps top 2% by installs gained this week (148 peers growing)
  • ⭐Rating steady at ★ 4.25 since Sep 26
  • 🛠Updates actively updated · updated 20 days ago · every ~18 days (3 updates tracked)
  • 🔁Ownership the developer account Mozilla Thunderbird changed company behind it · Nov 3, 2026
Installs since launch
0 73K 146K 146K Sep 30, 2024 today
+4,049 installs · +30 ratings since Sep 26
Update history
25.0b2 Oct 20, 2026 · seen Oct 28, 2026
Thunderbird version 25.0b2<br><br>Changed:<br>- Remote Feature Flags temporarily disabled to investigate startup freeze on splash screen<br><br>Fixed:<br>- Message composer could crash when rotating screen or editing message as new<br>
25.0b1 Oct 6, 2026 · seen Oct 17, 2026
Thunderbird version 25.0b1<br><br>New:<br>- New funding appeal helps keep Thunderbird alive!<br>- Feature flags can be updated without app updates<br><br>Fixed:<br>- Deleted email notifications could reappear<br>- HTML signature text disappeared after rotation<br>- HTML drafts could hide or lose attachments<br>- Add to contacts crashed without a Contacts app<br>- Large PGP attachments showed no en
24.0b2 Sep 14, 2026 · seen Sep 26, 2026
Thunderbird version 24.0b2<br><br>Fixed:<br>- Attachment filenames with non-ASCII characters were incorrectly decoded and saved<br>- HTML signature text could disappear after rotating the screen<br>
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Thunderbird Beta for Testers is a communication app by Mozilla Thunderbird with 100,000+ downloads (about 146K estimated). +1.5K installs in the last 7 days. Rated 4.2 from 1.8K ratings. Released Sep 30, 2024. Install growth, rank history, SDKs and ad networks.

From the store listing: “Help make the next Thunderbird release as awesome as possible by downloading Thunderbird Beta and getting early access to the latest features and bug fixes before they're officially released. Your testing and feedback are important, so please report bugs, rough edges, and share your thoughts with us! Find our bug…”