Blue Essence Seamonkey Theme Requires Restart
Dark navigator theme based on a default Classical theme and now works on Linux :)
Preview lightweight theme when hover on menuitems in Apply Theme menu.
jsbtn Requires Restart
JS on/off status bar button
Save better history for fragment URLs.
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.
From/To Column Requires Restart
Add a “From/To” column which shows the recipient if you are the sender.
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.
ToggleDocumentColors_ Requires Restart
Adds a toolbar button and keyboard shortcut to switch between the default page colors and user-defined colors.
Firefox shortcut: Control-Shift-C
SeaMonkey shortcut: Control-K
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.
Dynamic creation of bookmark-style toolbar buttons which you can customize.
Duplicate Tab Requires Restart
Duplicate Tab allows you to clone a tab along with its...
xSidebar Requires Restart Featured
Firefox style sidebars for SeaMonkey...
When you press the middle mouse button or scroll wheel mouse show popup window the history in the url bar and search bar.
Want to change from one language to another? Zing! and the locale is switched.
Reload page without using content stored in the browser cache to make sure you get any updates.
A full featured color selector tool, to work with colors, and easily find the colors you want.
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
Shift+LeftClick XUL Requires Restart
This simple addon has only this functionality, nothing else: it opens links in a new active tab with Shift+LeftClick (left mouse button click).
Better use https://addons.mozilla.org/ru/firefox/addon/shiftleftclick-opens-links-in-/ for FireFox.