Up & Coming Extensions
Allows to modify the header and the source of messages
Checks all installed add-ons for compatibility with Thunderbird 91 (next ESR) and displays status information on a button in the main toolbar. This button will open a detailed overview, including links to alternatives for abandoned add-ons.
This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.
Please read the "About this Add-on" section below carefully!
gContactSync Requires Restart
Synchronizes contacts & groups between Thunderbird and Google Contacts.
FileLink provider for WebDAV Featured
Uploads your large attachments to your WebDAV account instead of sending them by email.
Export your mails and folders to a zip file!
Calendar Tweaks Requires Restart
Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.
LightningButton Requires Restart
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
Adds a Restart Button, restarts Thunderbird
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
This extension will minimize Thunderbird on startup, it is very simple and I didn't put much work into it but it should work on all platforms. Please let me know if you want more features added into it.
Upload large attachments to your Cloud and send the link by email
Follow up for Thunderbird E-Mails.
Dark mode for every email. Take care of your eyes, use dark theme for night and daily messaging.
French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.
Account Colors Requires Restart
Associates user-defined colors with POP3/IMAP accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.
Adds calendars containing the birthdays from your address books.
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
Beautifully visualized statistics for your Thunderbird Email Accounts