Interface Customizations

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Stylish

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (726)
776,196 users
Updated February 27, 2015

Menu Wizard

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (73)
10,978 users
Updated February 23, 2015

Theme Font & Size Changer No Restart

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 5 out of 5 stars (140)
96,906 users
Updated February 23, 2015

Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (138)
43,469 users
Updated February 18, 2015

Forecastfox (fix version)

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Rated 5 out of 5 stars (76)
8,864 users
Updated February 10, 2015

SeaTab-X-2

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (12)
608 users
Updated February 9, 2015

Black background and white text No Restart

Makes black background and white text on every page

Rated 5 out of 5 stars (9)
2,929 users
Updated February 7, 2015

CuteButtons - Crystal SVG

add icons to buttons/menus/anywhere (CuteMenus - Crystal SVG not required)

Rated 4 out of 5 stars (84)
10,888 users
Updated February 6, 2015

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 (35)
11,164 users
Updated February 4, 2015

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (4)
8,927 users
Updated January 29, 2015

True Full Screen in SeaMonkey No Restart

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.

Rated 5 out of 5 stars (1)
70 users
Updated January 26, 2015

Drag-Select Link Text No Restart

Select link text with easy drag gestures.

Rated 5 out of 5 stars (11)
348 users
Updated January 25, 2015

FlameFox 3 Rebrander

Rebrand SeaMonkey as Firefox 3 (by 2008WindowsVista and a11RyanC2)

Not yet rated
5 users
Updated January 23, 2015

New Tab Button 2

Provides a new tab button for the navigation toolbar.

Not yet rated
5 users
Updated January 22, 2015

Sort and Search Customization Dialogs

Sort and search for buttons in (any) toolbar customization dialog

Rated 4 out of 5 stars (13)
514 users
Updated January 14, 2015

Re-Pagination No Restart

See more search results etc. on one page, concatenating several pages together...

Rated 5 out of 5 stars (40)
4,294 users
Updated January 11, 2015

Zing! Locale Switcher No Restart

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

Rated 5 out of 5 stars (1)
115 users
Updated January 10, 2015

FAYT Revived

Regain possesion of your good "Find As You Type" search bar in Firefox and SeaMonkey!

Rated 5 out of 5 stars (3)
65 users
Updated January 6, 2015

Sea Fox

Transform SeaMonkey into Firefox 3.x

Rated 5 out of 5 stars (5)
349 users
Updated January 6, 2015

MonkeyFix

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)
469 users
Updated January 3, 2015