Дополнения

British English Dictionary (Marco Pinto) от Marco A.G.Pinto

A fork of Mark Tyndall's add-on, based on David Bartlett's
British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.

V3.3.6 has 140 000+ new words and also fixes.

gContactSync от Josh Geenen

gContactSync - add-on, позволяющий синхронизировать ваши Google-контакты с Адресной Книгой Thunderbird 2 или 3.

Примечание подборщика old

Dizionario italiano от flod

Add support for Italian to spellchecking

CompactHeader от jmozmoz

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

Примечание подборщика old

Display Quota от Arnaud Abelard

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Google Calendar Tab от Bryan Clark

Adds the Google Calendar web interface as a new tab directly into Thunderbird. Creating and viewing events works just as it would in a browser like Firefox

Shrunked Image Resizer от Geoff Lankow

Make your photos smaller, so they don't take forever to email.

*Shrunked Image Resizer is no longer maintained.*

Address Close Button от 46emak

Adds a Address Close Button to mail compose window.

Search as list от psoebr

Search results appear as list (as per the "Open email as list" button).
- return to facet view with shift+close [x]
- auto open list view when few results found
- column config./sort/toggle [IMG3&4]
- apply columns to search as list menu [IMG5]

Extra Folder Columns от Joey Minta, Thunderbird Development Team

This extension is for those TB3 users who want the multiple-columns view that TB2 allowed

IMPORTANT: If you are using Thunderbird 38 or later, uninstall this addon. The functionality is in core now.

New Tab Button от H.Ogi

It provide you the following functionalities:
* Open a selected message in a tab by a toolbar button
* Open a message in a tab by double-clicking its header view (disabled by default)
* Hide Lightning's Today Pane on opening a tab

About Add-ons от RealityRipple

Adds an About button to extensions, themes, and languages in the Add-ons list.

AddressBookTab от pastisman

It adds a button that can be put in toolbars and that open the addressbook in a new tab

SmtpSelect от nr

A toolbar button providing easy access to choosing the default SMTP server in Thunderbird.

Select Address Book Text от craigm

Copy and paste a name, phone number, address or other text from your Thunderbird address book quickly, with just a single menu click.