Interface Customizations

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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 (119)
83,884 users
Updated July 8, 2014

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (4)
2,460 users
Updated June 30, 2014

Fierr

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

Rated 5 out of 5 stars (44)
4,027 users
Updated June 24, 2014

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 (100)
40,101 users
Updated June 21, 2014

SixOrNot No Restart

IP address information for Firefox. SixOrNot is an icon-based display of IPv6 availability and utilisation also providing a listing of domain names and IP addresses involved in loading web pages.

Rated 4 out of 5 stars (11)
2,771 users
Updated June 17, 2014

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (9)
4,227 users
Updated June 13, 2014

Sea Fox

Transform SeaMonkey into Firefox 3.x

Rated 5 out of 5 stars (4)
152 users
Updated June 11, 2014

SeaTab-X-2

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (8)
281 users
Updated June 11, 2014

S3.Menu Wizard

Customize menus : Helps removing, moving and renaming menus and menu items
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (15)
1,795 users
Updated June 11, 2014

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)
56 users
Updated June 10, 2014

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (70)
80,538 users
Updated June 3, 2014

YouTube Anywhere Player No Restart

Watch videos anywhere in cinema mode without leaving the website you're on.

Rated 5 out of 5 stars (45)
37,800 users
Updated May 30, 2014

CuteButtons - Crystal SVG

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

Rated 4 out of 5 stars (77)
10,847 users
Updated May 10, 2014

Shift+LeftClick XUL

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.

Not yet rated
2 users
Updated May 9, 2014

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)
332 users
Updated May 5, 2014

Sort and Search Customization Dialogs

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

Rated 4 out of 5 stars (11)
404 users
Updated May 4, 2014

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 (616)
689,223 users
Updated May 1, 2014

Stylish Tools

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

Rated 4 out of 5 stars (1)
860 users
Updated April 28, 2014

Add Search Engines for SeaMonkey

Add missing search-engine detection to SeaMonkey

Rated 4 out of 5 stars (1)
123 users
Updated April 24, 2014

Stylish Sync No Restart

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (17)
6,026 users
Updated March 23, 2014