Miscellaneous

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Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 4 out of 5 stars (5)
29,434 users

BlunderDelay

Thunderbird Extension: AutoSend Unsent Messages. Flushes entire outbox at regular intervals.

Rated 4 out of 5 stars (13)
1,395 users

Blinking Alert

Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.

Rated 4 out of 5 stars (27)
11,458 users

Quicktext

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Rated 5 out of 5 stars (248)
75,902 users

Imap-ACL-Extension

Extension to manage acls/permissions for shared mailboxes/folders on imap servers.

Rated 5 out of 5 stars (15)
2,408 users

Dropbox for Filelink

Add Dropbox support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (31)
21,062 users

Disable DragAndDrop (Thunderbird)

A Thunderbird extension which disables drag and drop in the folder pane.
This extension prevents unintended folder movement.

Rated 5 out of 5 stars (9)
1,781 users

ImportExportTools

Adds some tools to import and export folders and messages

Rated 4 out of 5 stars (112)
312,981 users

Mail Redirect Featured

Allow to redirect (a.k.a. "bounce") mail messages to other recipients.

Rated 4 out of 5 stars (119)
31,644 users

Folder Filters Button

Just a very simple add-on that adds a toolbar button to execute the "Run Filters on Folders" from Tools menu.

Rated 5 out of 5 stars (14)
3,694 users

Copy Plain Text 2

Copies text without formatting

Rated 5 out of 5 stars (55)
37,482 users

Send Filter

This add-on allows you run your message filters automatically on outgoing messages after sending. In other words, it's a outgoing filter for thunderbird and seamonkey.

Rated 4 out of 5 stars (38)
5,163 users

Outgoing Message Format

Set the default outgoing message format to Auto-Detect, Plain Text Only, Rich Text (HTML) or Plain and Rich (HTML) Text.

Rated 4 out of 5 stars (8)
2,672 users

Select Inbox

Automatically select the Inbox folder at startup, even if there is no account set to automatically check for new emails.

Important: the author will provide no other update for this add-on.

Rated 4 out of 5 stars (11)
3,318 users

Extension Auto-Installer No Restart

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.

Rated 5 out of 5 stars (12)
3,928 users

SmtpSwitch

SmtpSwitch allows to choose the smtp server when clicking on the 'Send' button.

Rated 4 out of 5 stars (21)
2,322 users

.vcs Support

Import and export calendar files in vCalendar (.vcs) format

Rated 3 out of 5 stars (17)
9,561 users

GlassMyBird No Restart

GlassMyBird enables more AeroGlass effects than the default Thunderbird theme (only possible on Windows Vista and 7 when AeroGlass is enabled). See instructions inside add-on description how to enable Glass on Windows 8.

Rated 5 out of 5 stars (2)
1,097 users

Year view

Year view for calendar.

Rated 4 out of 5 stars (44)
4,458 users

NestedQuote Remover

Remove nested quotes when replying to a...

Rated 3 out of 5 stars (16)
3,445 users