This extension enables true full screen mode in SeaMonkey for HTML5 video players, slide-shows, etc. and also for full screen invoked manually with the F11 key.
SeaTab-X-2 Requires Restart
Adds Firefox-style tab closers into SeaMonkey.
ThreadKey Requires Restart
Strike the 'T' key to sort messages by thread, strike the 'U' key to sort them unthreaded again, just like the 'G' key switches to Grouped By Sort view.
Dynamic creation of bookmark-style toolbar buttons which you can customize.
Adds toolbar buttons for each restartless add-on (including user scripts and plugins) to toggle its enabled state.
Joomla! Admin Requires Restart
Joomla! Admin brings ease & convenience to your computer/workstation, by providing you with a ready-to-use menu options that balms your repetitive work :) Now, Go to the Administrator page or Duplicate the current tab to a new tab/window in a jiffy!!
Right Links Requires Restart
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.
Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.
CuteMenus - Crystal SVG Requires Restart
Note from Mozilla: This add-on has been discontinued. Try Menu Icons Plus instead.
Adds icons to all menus along with some other features...
Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.
HTitle (discontinued) Requires Restart
Hide title bar if window is maximized.
This add-on has been discontinued!
Legacy extensions support will be dropped in Firefox 57. If you interest in CSD on Linux, please track progress on https://bugzilla.mozilla.org/show_bug.cgi?id=1283299.
SM Home Button Requires Restart
Navigation bar Home Button (resurrected by sailfish)
Export All Certificates Requires Restart
Adds an option to export all root certificates.
Flexible Sidebar allows to change sidebar width by dragging the handles.
Fierr Requires Restart
Replaces the error page with a more stylish appearance with additional features.
Keeps track of your browser tab number.
Tab Clicking Options Requires Restart
Select actions for various clicking events on a tab or the tab...
MonkeyFix Requires Restart
Fixes up numerous SeaMonkey browser interface issues (eg. adding support for popup ALT attributes), as well as adding some handy features for developers and power users (eg. configure source viewer, work online/offline).
MailNews Status Icons Requires Restart
Adds status icons for replied and forwarded messages to SeaMonkey MailNews.
jQuery Requires Restart
jQuery and jQuery UI embedded in browser