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New Tab Button

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

Rated 4 out of 5 stars (9)
903 users

Eesti keele speller

Estonian spellchecking dictionary for Firefox, Thunderbird and Seamonkey...

Rated 5 out of 5 stars (9)
1,598 users

ToggleReplied

Enables toggling of replied and forwarded states of messages.

Rated 5 out of 5 stars (8)
308 users

Show InOut

Adds some columns to the tableview. One shows an indicator wether a mail is incoming or outgoing, other shows the sender, the recipient(s) or the correspondent(s). Columns can be shown as name only, address only or both.

Rated 5 out of 5 stars (41)
918 users

Phoenity Buttons

Adds some toolbar buttons using phoenity icons.

Rated 4 out of 5 stars (16)
4,536 users

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)
725 users

mailmindr

Follow up for Thunderbird E-Mails.

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

Rated 4 out of 5 stars (78)
3,559 users

Korean spellchecker

Korean (ko-KR) spellchecker

Rated 5 out of 5 stars (12)
404 users

Rescue Conflicting Alternatives

Renders conflicting alternative bodies if the message has them.

Not yet rated
41 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)
3,439 users

Copy Message ID

Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.

Rated 5 out of 5 stars (3)
361 users

Urdu Dictionary

This dictionary is based on the urdu word list provided at www.crulp.org and the word list compiled by our friends at http://www.urduweb.org/mehfil/

Rated 4 out of 5 stars (16)
21 users

Colored Diffs

Color diffs sent by SVN/CVS/GIT/Mercurial...

Rated 4 out of 5 stars (20)
563 users

Folder Account

Lets you associate user accounts and identities with specific folders. Great for multiple users who share TB, or for managing mailing lists.

Rated 4 out of 5 stars (63)
2,250 users

English-Russian dictionary

Spelling of English and Russian words

Rated 4 out of 5 stars (22)
712 users

Srpski

Spell check dictionary for Serbian (Cyrillic and Latin)

Rated 4 out of 5 stars (10)
851 users

Marathi Dictionary

This dictionary is based on the Marathi word list provided
http://code.google.com/p/hunspell-marathi-dictionary/

Rated 4 out of 5 stars (7)
30 users

Evernote Tab

Add a button and a menu to open Evernote in tab.

Rated 3 out of 5 stars (9)
452 users

Valencian Catalan dictionary

Free Catalan (Valencian version) spelling dictionary.

Rated 4 out of 5 stars (32)
820 users

Greek Polytonic Spelling Checker

Διορθωτὴς πολυτονικῶν κειμένων σύμφωνος μὲ τὴν ἑλληνικὴ ἱστορικὴ ὀρθογραφία.

Rated 5 out of 5 stars (8)
20 users