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gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Rated 4 out of 5 stars (416)
13,501 users

Sieve

This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...

Rated 4 out of 5 stars (49)
418 users

Gmail Buttons Requires Restart

Adds message-specific buttons to Thunderbird that are consistent with the way Gmail handles Trash and Spam.

Rated 4 out of 5 stars (15)
9 users

US English Medical Dictionary Requires Restart

Adds 7,500+ medical terms to the standard US English dictionary. Enabled by right clicking on a textarea, selecting "Languages" then "English (Medical)". For use in Firefox, Thunderbird and SeaMonkey.

Rated 1 out of 5 stars (2)
1 user

Mongolian Spellchecking Dictionary

Mongolian Spellchecking Dictionary

Rated 5 out of 5 stars (49)
11 users

Disable Signature Requires Restart

Allows to disable the S/MIME signature of messages. Afterwards, these messages are no longer recognized as signed and their attachments can be deleted or detached.

Rated 5 out of 5 stars (2)
5 users

DeepDark for Thunderbird Requires Restart

Dark mode for Thunderbird UI

Rated 5 out of 5 stars (44)
90 users

TransliteRussian for Thunderbird

Печатаем по русски на разных клавиатурах.
E-Mails auf Russisch auf verschiedenen Tastaturen in Thunderbird.
Typing Russian on English, German and other keyboards without thinking about the layout.

Rated 4 out of 5 stars (1)
42 users