Miscellaneous

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Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (149)
37,701 users

Mail Redirect Featured

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

Rated 4 out of 5 stars (128)
36,007 users

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 (6)
35,595 users

Font Finder

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)
34,003 users

Display Quota

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)
31,311 users

MR Tech Toolkit

(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)
30,014 users

PrintingTools

Adds some options to print messages and addressbooks

Rated 5 out of 5 stars (22)
28,504 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (191)
27,970 users

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (172)
26,918 users

Restartless Restart No 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 (214)
26,252 users

Restart

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

Rated 5 out of 5 stars (53)
25,190 users

Thunderbird Message Filter Import/Export Enhanced

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 (44)
24,939 users

Dropbox for Filelink

Add Dropbox support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (38)
22,280 users

Copy As Plain Text

Removes formatting from copied text.

Rated 4 out of 5 stars (59)
20,817 users

LightningButton

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

Rated 5 out of 5 stars (14)
19,107 users

AutoCopy 2

Copies selected text to the clipboard automatically.

Rated 5 out of 5 stars (62)
18,557 users

Cleanest Addon Manager No Restart

Cleanup your Addon Manager

Rated 5 out of 5 stars (136)
18,524 users

Google Tasks Sync

Manage your tasks from Thunderbird, even while offline.

Rated 4 out of 5 stars (75)
17,859 users

Dafizilla Table2Clipboard

Mozilla applications allow to select rows and columns from a table simply pressing Control key and picking rows/columns with left mouse button.
The selection can be copied to clipboard but the original table disposition is lost making ugly results wh...

Rated 5 out of 5 stars (63)
17,846 users

Add-ons Manager Context Menu

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (35)
17,767 users