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.
Changes the mask character used in password fields.
Sea Fox Requires Restart
Transform SeaMonkey into Firefox 3.x
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).
Text2Link Requires Restart
Text2Link is a simple and easy-to-use way to copy the text of a link, or to open URLs and send emails to addresses not marked-up as HTML links.
ImageBlock for seamonkey Requires Restart
Updated version of imageblock by Hemant Vats to work with seamonkey 2.29.
Provides a fast way to disable images in web pages that's usually set by the image manager sub-menu.
Enhanced Priority Display Requires Restart
Enhanced thread pane display of message priorities.
A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.
Edit Bookmark Plus Requires Restart
Resize 'Add Bookmark' Popup / 'Edit This Bookmark' Popup, fixes tree selection bug, option to disable popup auto close & Update Url and/or Name of a bookmark with the Url/Title of current page.
Replacement of OpenBook addon
Want to change from one language to another? Zing! and the locale is switched.
Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.
Adds a few buttons to help with page navigation, including Page Top, Page Bottom, Page Down and Page Up.
Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.
Display Mail User Agent Requires Restart
Displays icon for user agent of received mails.
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
lolifox - Fierr MOD Requires Restart
Replaces the error page with a lolifox appearance with additional features.
KeePass Helper Requires Restart
Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.
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.
Fierr Requires Restart
Replaces the error page with a more stylish appearance with additional features.
SeaTab-X-2 Requires Restart
Adds Firefox-style tab closers into SeaMonkey.