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Reply As Original Recipient Requires Restart
Reply with the From: field set to the To: field from the original email.
Read2Me "speechify the web" Requires Restart
Webpage and email to speech extension using festival or any speech engine that can handle plain text files. This version has removed the option to use the embedded Flite-1.4 component on linux.
Personal Level Indicators Requires Restart
Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.
Column Reader
Web reader for wide screens and long documents. Read with pleasure in attractive layouts.
Extension List Dumper 2 Requires Restart
This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...
MyAdFilter
With MyAdFilter, free content creators propose you only one ad. Apart from those, as your usual ad-blocker, MyAdFilter disables all ads.
Eesti keele speller
Estonian spellchecking dictionary for Firefox, Thunderbird and Seamonkey...
Slideshow Requires Restart
Displays a slideshow of picture attachments. When email has attached pictures, it displays "View as Slideshow" button next to the attachment. Button click pops a slideshow window with all the images, allowing you to zoom in/out, save...
Trashcan Requires Restart
Have you ever accidentally deleted an event and didn't notice? Undo is no longer available? Then this extension is for you! All deleted items are put into a special Trashcan calendar for your safety.
Protected E-mail Addresses Requires Restart
Generates protected and disposable e-mail addresses and filters junk mail sent to invalid addresses.
Old-style smilies Requires Restart
Reverts the smilies in Thunderbird to those of version 2.
Thunderbird-DontRestoreTabs Requires Restart
Allows the user not to restore tabs at startup in Thundertbird
To create your own collections, you must have a Mozilla Add-ons account.