Interface Customizations


Black background and white text No Restart

Makes black background and white text on every page

Rated 5 out of 5 stars (29)
6,426 users
Added March 27, 2014


Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (16)
2,154 users
Added February 17, 2014

Search Engine Quick Switcher No Restart

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.

Rated 3 out of 5 stars (2)
17 users
Added January 29, 2014

Old Addon Manager

Brings back Firefox 3.x Addon Manager

Rated 5 out of 5 stars (1)
60 users
Added January 11, 2014

Lightweight Themes Preview for SeaMonkey No Restart

Preview lightweight theme when hover on menuitems in Apply Theme menu.

Rated 1 out of 5 stars (1)
2 users
Added December 4, 2013

Duplicate Tab Blocker No Restart

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.

Rated 3 out of 5 stars (10)
911 users
Added November 28, 2013

Lightweight Themes Manager No Restart

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (6)
14,578 users
Added November 17, 2013

Sea Fox

Transform SeaMonkey into Firefox 3.x

Rated 5 out of 5 stars (6)
567 users
Added November 11, 2013


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)
578 users
Added September 24, 2013

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (7)
12,584 users
Added September 6, 2013

Big Navigation No Restart

Increases the navigation links on the pages

Rated 5 out of 5 stars (5)
915 users
Added July 18, 2013

RC Print

Adds a "Print" option to the Right-Click context menu.

Rated 5 out of 5 stars (2)
1,148 users
Added July 8, 2013

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (18)
2,333 users
Added June 17, 2013

Google Redesigned 2

Ported version from Firefox to be compatible with Seamonkey 2.

A complete redesign of popular Google services, Google Redesigned changes the appearance of popular Google services.

Not yet rated
18 users
Added May 27, 2013


NiceReader is designed for web reading. You can customize font, color, size, background, specify the elements to read, filiter ad elements, filiter ad strings, automaticaly turn page.

Rated 5 out of 5 stars (2)
218 users
Added May 15, 2013

HTML5 Loop

Loop HTML5 Video and Music.

Rated 1 out of 5 stars (13)
1,435 users
Added April 5, 2013

Stylish Tools

Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey

Rated 5 out of 5 stars (2)
1,214 users
Added April 3, 2013

Show History Popup No Restart

When you press the middle mouse button or scroll wheel mouse show popup window the history in the url bar and search bar.

Rated 4 out of 5 stars (2)
105 users
Added March 23, 2013

Dybutar No Restart

Dynamic creation of bookmark-style toolbar buttons which you can customize.

Rated 5 out of 5 stars (6)
177 users
Added February 8, 2013

GNotifier No Restart

Add-on for Firefox and Thunderbird. Integrates Firefox's notifications with the OS's native notification system. It supports most Linux desktops and Windows 8.

Rated 5 out of 5 stars (42)
11,759 users
Added January 26, 2013