Thunderbird 12

• If you use a password manager, Android will now use it to automatically fill in your password when you add a new account.

Thunderbird 11

• Mail folders are easier to navigate.
• Algorithmic darkening makes reading emails easier in dark mode.
• Thunderbird 11.1 : Selected/read/unread message states are now easier to distinguish visually.
• You can still see font settings if you search for font in Settings. This will be removed in a future Thunderbird release. Please use the Android operating system font size settings instead.

Thunderbird 10

• You can now empty your Spam folder by tapping Empty Spam in the Spam folder's menu ⋮ (also known as the kebab menu because the 3 vertical dots resemble a kebab).
• On Android 10 or older, you now have an option to use the system theme.
  1. Tap ≡ at the top left > tap the gear icon: at the bottom left.
  2. Tap General settings > tap Display > tap Use system default under Theme

Thunderbird 9

• Initial Android 15 support.
• Thunderbird attempts to use your email provider's auto configuration database. If it fails it, it uses Mozilla's database.

Thunderbird 8

• Refer to New in Thunderbird for Android version 8 please.