Welcome to SeaMonkey Add-ons.
Add extra features and styles to make SeaMonkey your own.Close
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
Theme Font & Size Changer No Restart
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
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!
Old Default Image Style No Restart
Restores the default image style used for top-level images in previous versions of Firefox.
GNotifier No Restart
Add-on for Firefox and Thunderbird. Integrates Firefox's notifications with the OS's native notification system. It supports most Linux desktops and Windows 8.
Adds Firefox-style tab closers into SeaMonkey.
Stylish Sync No Restart
Sync engine for Stylish with backup / restore facility.
Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey
This extension allows to open links in new tabs with right-click directly and using “long” left-click.
This is very useful for touchpads on notebooks and for mice without middle button.
Add-ons Manager - Version Number No Restart
Restores add-on version number inside Add-on Manager for latest builds of Firefox, Thunderbird and Seamonkey.
F.B. Purity - Cleans Up Facebook No Restart
F.B. Purity hides the ads, app spam and other annoying clutter from your facebook news feed, lets you increase the font size, change colours plus many more features and generally makes Facebook a lot less annoying to use.
Replaces the error page with a lolifox appearance with additional features.
Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.
Now Available for: Firefox, Thunderbird and SeaMonkey!
Drag-Select Link Text No Restart
Select link text with easy drag gestures.
Black background and white text No Restart
Makes black background and white text on every page
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.
YouTube Anywhere Player No Restart
Watch videos anywhere in cinema mode without leaving the website you're on.
Replaces the error page with a more stylish appearance with additional features.
Make the “Received” column in IMAP folders show when messages were actually received.