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.
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.
Link Status Redux Requires Restart
Shows an indicator on the status bar in front of the link address when the mouse cursor is over a link to a page you have bookmarked or visited before.
Open With Vivaldi Browser sends pages from Mozilla Firefox to Vivaldi browser.
Single Key Tab Switch Requires Restart
Single Key Tab Switch provides configurable single hotkeys for switching tabs, like the 'Single-key shortcuts' feature of the Opera browser.
enlarging the navigation links on the pages
Tab Clicking Options Requires Restart
Select actions for various clicking events on a tab or the tab...
Dynamic creation of bookmark-style toolbar buttons which you can customize.
SeaMonkey Vertical Tab Bar Requires Restart
Tab bar on the side of the window for SeaMonkey.
CheckBoxMate Lefedor Edition Requires Restart
Check multiple checkboxes by drawing a rectangle around them. FF6 version.
I've made this version since i did need it for use with RTM,
Remember Mismatched Domains Requires Restart
The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...
HashColouredTabs+ Requires Restart
Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★
Flexible Sidebar allows to change sidebar width by dragging the handles.
Tategaki Requires Restart
Tategaki allows vertical writing-mode on mail compose window.
Export All Certificates Requires Restart
Adds an option to export all root certificates.
Zorcher Requires Restart
Selecting a small text on the page do not need to copy it into the search bar of your browser or search engine. Just press the right mouse button and select the search service from the available list.
Changes the mask character used in password fields.
Want to change from one language to another? Zing! and the locale is switched.
TaQuilla Requires Restart
Automatic tagging using Bayesian statistics