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Header Tools Lite

Allows to modify the header and the source of messages

Rated 5 out of 5 stars (22)
4,312 users

Simple HT Jumper

A temporal simple jumper of HTML and Plan TEXT view mode on showing messages and replying messages for Thunderbird without changing the default setting.

Rated 5 out of 5 stars (15)
687 users

Close tab on ESC

Closes a Mozilla Thunderbird tab when pressing the Escape key.

Rated 5 out of 5 stars (38)
2,452 users

ThunderUpdate

Have ThunderBrowse version 2.8.7 or earlier? Install 3.0 from here: https://addons.mozilla.org/en-US/thunderbird/addon/5373 YOU DO NOT NEED TO INSTALL THUNDERUPDATE. GO INSTALL THUNDERBROWSE INSTEAD.

Rated 5 out of 5 stars (11)
27 users

Email Notification Randomizer

Extension to randomize the email notification sound. Each time an email is received, the configured email notification sound is updated from the set of wav files in the configured folder...

Rated 5 out of 5 stars (9)
88 users

Show All Body Parts No Restart

Enable the View | Message Body As | All Body Parts message display mode.

Rated 5 out of 5 stars (16)
7,009 users

Simple Search-For Extension

Adds a "Search for" item to Thunderbird's context menu, like in Firefox.

Rated 5 out of 5 stars (14)
1,552 users

FolderFlags

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (8)
3,925 users

Smiley Fixer

Fixes Wingding Smileys in Outlook-generated emails

Rated 5 out of 5 stars (15)
4,440 users

Message Notes Plus

Message Notes Plus allows to add notes to emails. The notes don't affect the email in any way.
They are stored locally on your hard drive.

The commercial version of the add-on allows to share notes with other users: http://msgnotes.alehro00.com

Rated 5 out of 5 stars (24)
4,371 users

Manually sort folders

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (104)
91,753 users

DictionarySearch (Official Version)

Looks up a user selected word in an online...

Rated 4 out of 5 stars (116)
10,345 users

Disable "You"

Addresses in the From/To/Cc headings are since Thunderbird 3 replaced with word "You" if they match any of your identities. This extension disables this function.

Rated 5 out of 5 stars (17)
2,498 users

POW -- Plain Old Webserver

Turn the web on its head with the Plain Old Webserver (POW), which adds a server to your browser.

Rated 5 out of 5 stars (17)
90 users

Equations

Insert inline LaTeX equations into e-mail messages.

Rated 5 out of 5 stars (22)
170 users

JunQuilla

1) adds column with percent likelihood that a message is spam, 2) extends junk status column to show why a message was classified as junk/good, 3) adds an Uncertain folder for messages needing user decision.

Rated 5 out of 5 stars (17)
3,168 users

ThreadVis

Displays a small graphic visualising the context (thread) of the currently selected email.

Rated 4 out of 5 stars (107)
9,469 users

Remove Duplicate Messages (Alternate)

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (141)
61,176 users

dictCheck

dictCheck - Double click on any english word in a page to get the polish meaning. Uses fast online dictionary.
Simple and easy! Enjoy!

Rated 5 out of 5 stars (6)
503 users

Reply In Group

Adds "Reply In Group" and "Reply to sender" toolbar buttons to the main window. So it's easier to reply in Usenet...

Rated 5 out of 5 stars (6)
9 users