Interface Customizations

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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.

Rated 4 out of 5 stars (28)
697 users
Updated Dec. 29, 2015

Password Mask Changer

Changes the mask character used in password fields.

Rated 5 out of 5 stars (4)
36 users
Updated Dec. 19, 2015

Sea Fox Requires Restart

Transform SeaMonkey into Firefox 3.x

Rated 4 out of 5 stars (12)
314 users
Updated Dec. 1, 2015

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).

Rated 5 out of 5 stars (3)
211 users
Updated Oct. 30, 2015

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.

Rated 4 out of 5 stars (41)
2,059 users
Updated Sept. 6, 2015

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.

Not yet rated
11 users
Updated Aug. 24, 2015

Enhanced Priority Display Requires Restart

Enhanced thread pane display of message priorities.

Rated 5 out of 5 stars (6)
1,184 users
Updated July 25, 2015

Profile Buttons

A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.

Rated 4 out of 5 stars (8)
1,142 users
Updated July 23, 2015

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

Rated 4 out of 5 stars (65)
2,670 users
Updated July 13, 2015

Zing! Locale Switcher

Want to change from one language to another? Zing! and the locale is switched.

Rated 5 out of 5 stars (2)
245 users
Updated July 7, 2015

Page Colors & Fonts Buttons

Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.

Rated 5 out of 5 stars (7)
1,448 users
Updated June 11, 2015

Page Navigation Buttons

Adds a few buttons to help with page navigation, including Page Top, Page Bottom, Page Down and Page Up.

Rated 5 out of 5 stars (3)
240 users
Updated June 11, 2015

All Menus Button

Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.

Rated 4 out of 5 stars (13)
1,136 users
Updated June 11, 2015

Display Mail User Agent Requires Restart

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (104)
30,848 users
Updated May 25, 2015

InspectorWidget Requires Restart

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.

Rated 5 out of 5 stars (10)
677 users
Updated May 23, 2015

lolifox - Fierr MOD Requires Restart

Replaces the error page with a lolifox appearance with additional features.

Rated 5 out of 5 stars (34)
2,265 users
Updated May 23, 2015

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.

Rated 4 out of 5 stars (40)
3,792 users
Updated May 4, 2015

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.

Rated 5 out of 5 stars (129)
4,789 users
Updated April 18, 2015

Fierr Requires Restart

Replaces the error page with a more stylish appearance with additional features.

Rated 5 out of 5 stars (48)
1,313 users
Updated April 7, 2015

SeaTab-X-2 Requires Restart

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (21)
1,998 users
Updated Feb. 28, 2015