ImportExportTools Requires Restart
Adds some tools to import and export folders and messages
QuickNote Requires Restart
A simple note-taking extension.
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.
PlayFlash 32bit Requires Restart
Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.
ChatZilla Requires Restart
A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
AutoCopy 2 Requires Restart
Copies selected text to the clipboard automatically.
MinimizeToTray Requires Restart
Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible...
CardDAV Browser Requires Restart
A utility to browse vCards stored on a CardDAV server.
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.
Contact Photos Requires Restart
Displays contact photos in the message header.
Highlighter Requires Restart
Quickly highlight some text in Thunderbird message composing windows.
AutoProxy-ng Requires Restart
This is a fork of AutoProxy, which can run the latest version of Firefox.
Lightbird Requires Restart
Standalone calendar UI for Lightning
PlayFlash 64bit Requires Restart
Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.
Add-ons Manager Context Menu Requires Restart
Add more items to Add-ons Manager context menu.
Reinstates the extensions.checkCompatibility preference.
Diagnostics tool for Adblock Plus, provides some insight into internal processes of Adblock Plus.
Mouse Gestures Suite Requires Restart
Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.