SeaTab-X-2 Requires Restart
Adds Firefox-style tab closers into SeaMonkey.
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.
FlameFox 3 Rebrander Requires Restart
Rebrand SeaMonkey as Firefox 3 (by 2008WindowsVista and a11RyanC2)
New Tab Button 2 Requires Restart
Provides a new tab button for the navigation toolbar.
Sort and Search Customization Dialogs Requires Restart
Sort and search for buttons in (any) toolbar customization dialog
FAYT Revived Requires Restart
Regain possesion of your good "Find As You Type" search bar in Firefox and SeaMonkey!
HTML5 Loop Requires Restart
Loop HTML5 Video and Music.
Restores the default image style used for top-level images in previous versions of Firefox.
Stylish Tools Requires Restart
Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey
Add Search Engines for SeaMonkey Requires Restart
Add missing search-engine detection to SeaMonkey
Sync engine for Stylish with backup / restore facility.
Switch the current search engine on the fly! Press Control + Shift + Down Arrow to switch to the next search engine or Control + Shift + Up Arrow to select the previous one.
Manage your installed personas (lightweight themes).
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.
Preview lightweight theme when hover on menuitems in Apply Theme menu.
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.
Dynamic creation of bookmark-style toolbar buttons which you can customize.
TaQuilla Requires Restart
Automatic tagging using Bayesian statistics
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
jQuery Requires Restart
jQuery and jQuery UI embedded in browser