Miscellaneous

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Toggle Proxy Requires Restart

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 (43)
11,244 users

ToggleReplied Requires Restart

Enables toggling of Replied/Forwarded states of messages.

Rated 5 out of 5 stars (7)
682 users

ToneQuilla Requires Restart

Adds a new action to mail filters to allow playing a particular sound when the filter matches. Also includes several sample sound files.

Rated 4 out of 5 stars (16)
2,740 users

Toodledo Sync Requires Restart

ToodledoSync is an extension that I did for my need of a GTD system using Thunderbird and Toodledo.
IT IS NOT MAINTENED ANYMORE as I do not have any time. I'll give the (ugly) code to anyone willing to maintain it.

Rated 4 out of 5 stars (1)
519 users

Toolbar Buttons

Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.

Rated 4 out of 5 stars (324)
107,028 users

Tools > Options… for Linux

Moves Edit > Preferences to Tools > Options…

Rated 5 out of 5 stars (7)
336 users

traduku Requires Restart

Translate text from English and other languages into Esperanto.

Traduku tekston de la angla kaj aliaj lingvoj al Esperanto.

Rated 5 out of 5 stars (1)
205 users

Trashcan Requires Restart

Have you ever accidentally deleted an event and didn't notice? Undo is no longer available? Then this extension is for you! All deleted items are put into a special Trashcan calendar for your safety.

Rated 4 out of 5 stars (3)
533 users

Tv program Requires Restart

It shows popular stations TV program in listings, alerts and bubble infos. It's only for Czech and Slovak TV stations.
Localization: sk, cs, hu, en

Rated 2 out of 5 stars (9)
59 users

Ubuntu Unity unread count and quicklist Requires Restart

Notify Unity of new mails in Thunderbird. Also, right click Thunderbird icon and get new quicklist items: Compose new mail and Contacts.

Based in awn-notif by Thesa aka Florian Birée

Rated 5 out of 5 stars (9)
34 users

UMTools Requires Restart

Add new options to TB's Unsent Messages behavior.. ...

Rated 3 out of 5 stars (3)
3 users

Unifinder Views Requires Restart

Add more views to the unifinder (event list) in Sunbird and Lightning.

Rated 5 out of 5 stars (1)
10 users

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 5 out of 5 stars (227)
87,213 users

Unread Count Requires Restart

Maintains a file in the profile root directory with counts for unread messages per account. Useful for display in generic status bar, e.g.: taffybar, xmobar, dzen2, etc

Rated 5 out of 5 stars (2)
96 users

Update Notifier Requires Restart

Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.

Notifies you when updates are available for your extensions and themes.

Rated 5 out of 5 stars (180)
6,435 users

URL Link Requires Restart

URL Link is a small Firefox and Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.

Rated 4 out of 5 stars (50)
11,484 users

URLFilter

Block advertisement and access to adult sites

Rated 4 out of 5 stars (15)
3,794 users

Use Bcc Instead Requires Restart

Who among us has not made the mistake of sending a 'broadcast' email to a large number of recipients without using BCC; thereby revealing everyone's email addresses to all? This simple add-on attempts to prevent this from occurring.

Rated 5 out of 5 stars (20)
4,251 users

UxU - UnitTest.XUL Requires Restart

This is a testing tool for addon developers.

Rated 3 out of 5 stars (5)
9 users

Version in Add-on bar Requires Restart

Show the Firefox/Thunderbird version number in the addon bar (formerly called status bar).

Rated 5 out of 5 stars (10)
755 users