Mail Redirect Requires Restart Featured

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

Rated 4 out of 5 stars (131)
37,981 users

Font Finder Requires Restart

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (71)
36,276 users

Diagnostics for Adblock Plus

Diagnostics tool for Adblock Plus, provides some insight into internal processes of Adblock Plus.

Not yet rated
36,082 users

Display Quota Requires Restart

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Rated 4 out of 5 stars (30)
35,164 users

Tiny JavaScript Debugger Requires Restart

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 (7)
34,575 users

PrintingTools Requires Restart

Adds some options to print messages and addressbooks

Rated 5 out of 5 stars (22)
34,214 users

Minimize On Start and Close Requires Restart

A remake of the MinimizeToTray-extension made to fit the Windows 7 taskbar. Instead of minimize the window to the tray it minimize it to the taskbar. It can minimize on startup, when the window is closed and/or when the esc key is pressed.

Rated 4 out of 5 stars (115)
30,765 users

MR Tech Toolkit Requires Restart

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...

Rated 4 out of 5 stars (143)
29,657 users

QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (174)
28,319 users

Nightly Tester Tools Requires Restart

Useful tools for the nightly tester.

Rated 4 out of 5 stars (194)
26,802 users

Restart Requires Restart

"Restart" menu and button, with configurable shortcut key.

Rated 5 out of 5 stars (57)
26,480 users

Thunderbird Message Filter Import/Export Enhanced Requires Restart

Thunderbird Message Filter Import/Export Enhanced is a compatibility port of Wind Li's add on.
Original add on here: https://addons.mozilla.org/en-US/thunderbird/addon/thunderbird-message-filter-imp/

Rated 3 out of 5 stars (45)
25,611 users

Restartless Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (216)
23,468 users

Dropbox for Filelink Requires Restart

Add Dropbox support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (42)
23,431 users


Ad Blocker lets you block all ads, tracking & malware from the web world. It is an effective solution to browse the web without offensive and annoying ads you hate to see.

Rated 4 out of 5 stars (7)
20,265 users

Copy As Plain Text Requires Restart

Removes formatting from copied text.

Rated 4 out of 5 stars (59)
20,060 users

LightningButton Requires Restart

Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.

Rated 5 out of 5 stars (14)
19,231 users

AutoCopy 2 Requires Restart

Copies selected text to the clipboard automatically.

Rated 5 out of 5 stars (68)
18,917 users

GPO support For Firefox and Thunderbird

Firefox and Thunderbird extension to manage user preferences and user profile CA certificates using GPOs

Rated 4 out of 5 stars (11)
18,774 users

Google Tasks Sync Requires Restart

Manage your tasks from Thunderbird, even while offline.

Rated 4 out of 5 stars (79)
18,601 users