Flaws are to be expected. High-impact flaws, including data loss, are very rare, but may occur. Protect yourself with <a href="https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile">backups</a>. Low-impact flaws may not be fixed quickly, because fixes are prioritized based on impact.
Flaws are to be expected. High-impact flaws, including data loss, are very rare, but may occur. Protect yourself with <a href="https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile">backups</a>. Low-impact flaws may not be fixed quickly, because fixes are prioritized based on impact.