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Layout Button

A toolbar button to switch between layouts.

Version 4 (Requires TB v128+): The button cycles through layouts, Context menu (right-click the button) allows for selecting specific layout
Version 1 to 3: The button used a popup to select layouts

Rated 5 out of 5 stars (6)
742 users

Protected E-mail Addresses Requires Restart

Generates protected and disposable e-mail addresses and filters junk mail sent to invalid addresses.

Rated 4 out of 5 stars (1)
1 user

Traditional Chinese (zh-TW) Language Pack

Traditional Chinese (zh-TW) Language Pack

Not yet rated
17,447 users

Old-style smilies Requires Restart

Reverts the smilies in Thunderbird to those of version 2.

Rated 4 out of 5 stars (1)
4 users

Track Package Requires Restart

Track Packages from the right-click menu...

Rated 4 out of 5 stars (30)
6 users

mailmindr

Follow up for Thunderbird E-Mails.

Web: https://mailmindr.net/
Twitter: @mailmindr

Rated 4 out of 5 stars (80)
3,868 users

Sensitivity Header Requires Restart

Implement the "Sensitivity" header for outgoing messages (described in RFC 4021 section 2.1.55).
This allows the user to select Private / Personal / Company-Confidential (or none) for an outgoing message.
No longer maintained: See below.

Rated 5 out of 5 stars (2)
50 users

Thunderbird-DontRestoreTabs Requires Restart

Allows the user not to restore tabs at startup in Thundertbird

Rated 4 out of 5 stars (3)
16 users

Flat Folder Tree Requires Restart

Selectively breakout or promote sub-folders under an intermediate folder in the folder tree. Use with IMAP servers where some folders remain collapsed under special namespace like [Gmail] or the INBOX itself.

Rated 4 out of 5 stars (32)
18 users

InfoQube Firefox extension Requires Restart

Extension to import html into InfoQube

Not yet rated
7 users

Korean spellchecker

Korean (ko-KR) spellchecker

Rated 5 out of 5 stars (12)
465 users

No More Install Delay

UPDATE: XPI delay has been removed in Firefox 40!

Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!

Unlike similar addons, this works on Firefox 4 and beyond.

Rated 4 out of 5 stars (10)
3 users

Rescue Conflicting Alternatives

Renders conflicting alternative bodies if the message has them.

Not yet rated
40 users

CruiseControl Monitor Requires Restart

CruiseControl build monitor

Rated 4 out of 5 stars (7)
0 users

Free Memory Button

Free unused memory that Firefox is currently using.

Rated 3 out of 5 stars (8)
5 users

Slovak spell checking dictionary

Slovak spell checking dictionary for Mozilla applications (based on the "open-source" dictionaries by Zdenko Podobný).

Rated 4 out of 5 stars (6)
3,291 users

Quicker Filer Requires Restart

Quicker Filer helps you file your messages into folders using keyboard shortcuts and quick search method. Navigate through folders by typing the start of a folder name and the Quicker Filer dialog will show you all folders that matches as you type.

Rated 4 out of 5 stars (46)
16 users

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (15)
8 users

TamilVisai (TamilKey) Requires Restart

A utility for typing in Tamil language. It will be ideal for Tamil bloggers...

Rated 4 out of 5 stars (28)
0 users

Restart application Requires Restart

Restart the application with one click (or Ctrl Shift Z)

Rated 4 out of 5 stars (15)
20 users