Up & Coming Extensions

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gContactSync

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (185)
48,284 users

Toggle Proxy

Toggle Proxy adds a status bar/toolbar icon to toggle between two proxy settings which can be set in the preferences or toggle via a shortcut key (alt + x) if you don't use the add-on bar.

Rated 4 out of 5 stars (41)
11,222 users

LookOut+

LookOut is a plugin which allows to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).

This version is a fix for Seamonkey 2.*.

Rated 4 out of 5 stars (3)
1,261 users

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (6)
10,105 users

Menu Filter No Restart

Keep your menus in check by filtering out items you never use.

Rated 4 out of 5 stars (31)
2,627 users

Bamboo Feed Reader

Feed reader | RSS - ATOM - OPML

Rated 4 out of 5 stars (233)
15,928 users

Encrypt if possible

Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.

Rated 5 out of 5 stars (14)
1,751 users

Pan No Restart

Block ads and manage proxy.

Rated 5 out of 5 stars (50)
2,014 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (189)
40,168 users

Address bulk copy (アドレス一括コピー)

Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
それを実現するためのアドオンです。

Rated 5 out of 5 stars (2)
1,189 users

tzpush

Z-Sync to Thunderbird Addressbook
Will sync Thunderbird address book to Zentyal, Zarafa, Horde and outlook.com/hotmail.

Rated 4 out of 5 stars (9)
1,346 users

Right Encoding

Adds the Character Encoding menu to the context menu

Rated 5 out of 5 stars (16)
4,383 users

Purge Events Plus

Purge events from Sunbird and Lightning files and thereby cleanes the calendar

Rated 4 out of 5 stars (9)
996 users

AutoarchiveReloaded

Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)

Rated 4 out of 5 stars (7)
3,302 users

Rikaichan Japanese-German Dictionary File

A dictionary file for Rikaichan.

Rated 5 out of 5 stars (1)
4,056 users

GProxy Tool

GProxy lets you set and clear GPass local proxy in Firefox and Thunderbird, and do more.

Rated 4 out of 5 stars (7)
5,811 users

Thunderbird Chat Notification

Chat notification for Mozilla Thunderbird. Notification with alert (click on alert open conversation) and sound.

Rated 4 out of 5 stars (5)
2,130 users

TrayHotKey

为Fx5.0 及以上版本提供系统热键(老板键)功能

Rated 5 out of 5 stars (46)
3,731 users

Password Tags

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (5)
2,813 users

Toggle Headers

Allows toggling the message header setting through a keyboard shortcut.

Rated 4 out of 5 stars (4)
1,010 users