Add-ons
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Folderpane Tools
Requires Restart
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.
Foobar Controls
Requires Restart
Allows you to control the Foobar2000 Mp3 player from the Firefox window...
ConQuery
Requires Restart
Context searching for everyone and URL manipulation tool for advanced users...
FlashGot Mass Downloader
Requires Restart
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
JavaScript Debugger
Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.
View Headers Toggle Button
Requires Restart
This extension adds a toolbar button that allows the easy toggling of viewing all message headers.
StockTicker
Requires Restart
Shows your favorite stocks in a customizable...
Quote Colors
Requires Restart
Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.
addressContext
Requires Restart
An extension to add addressbook-related options to the context...
Show SMTP Username
Requires Restart
Displays username (if available) next to SMTP...
Delete Junk Context Menu
Requires Restart
Adds 'Delete Mail Marked as Junk' to folders' right click...
Moji
Requires Restart
An integrated sidebar-dictionary for Japanese and Chinese including kanji dictionary.
Image Zoom
Requires Restart
Adds zoom and rotation functionality for images...
Forumzilla
Requires Restart
Forumzilla lets you read news and blog feeds in your email application. It is similar to the feed reader built into Thunderbird, but it lets you download stories into any folder in any POP, IMAP, or local account (configurable per...
Open Long Url
Requires Restart
Adds an option to your File menu to allow you to open long, multi-line...
Easy Get Mail Button
Requires Restart
Makes the 'Get new messages' button context-sensitive. Select an account root folder to get messages for that account, any other folder to get messages for all...
Buttons!
Requires Restart
Adds buttons to the Thunderbird toolbars such as Next! and Previous! buttons for navigating through all messages instead of just unread ones. See homepage for more...
Launchy
Requires Restart
Launchy will enable you to open links and mailto's with external applications...
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