Interface Customizations

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Sort and Search Customization Dialogs

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

Rated 5 out of 5 stars (10)
377 users

Status-Bar Custom Buttons

Create your own status-bar buttons.

Rated 4 out of 5 stars (9)
76 users

Statusbar Date()

Displays a highly customisable local or foriegn date/time in the statusbar.

Rated 4 out of 5 stars (45)
4,308 users

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 (600)
674,303 users

Stylish Sync No Restart

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (13)
6,088 users

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)
684 users

Stylish-Custom

abandoned, use Stylish Custom Add-on instead
http://forum.userstyles.org/discussion/37939/stylish-custom-add-on/p1

custom additions to Stylish extension.
brings back features from 0.5.9 and adds new features

Rated 4 out of 5 stars (35)
3,648 users

Tab Clicking Options

Select actions for various clicking events on a tab or the tab...

Rated 4 out of 5 stars (71)
825 users

tab-counter

shows the number of tabs in the status-bar

Rated 5 out of 5 stars (5)
430 users

Tabs Menu

Adds a Tabs menu to the main menu that lets you easily change between tabs.

Rated 4 out of 5 stars (27)
3,499 users

TaQuilla

Automatic tagging using Bayesian statistics

Rated 4 out of 5 stars (8)
307 users

Theme Font & Size Changer

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 (113)
81,437 users

ThreadKey

Strike the 'T' key to sort messages by thread, strike the 'U' key to sort them unthreaded again, just like the 'G' key switches to Grouped By Sort view

Rated 4 out of 5 stars (21)
1,461 users

ToggleDocumentColors_

Adds a toolbar button and keyboard shortcut to switch between the default page colors and user-defined colors.
Firefox shortcut: Control-Shift-C
SeaMonkey shortcut: Control-K

Rated 4 out of 5 stars (9)
427 users

Togglify Add-on Toggler No Restart

Adds toolbar buttons for each restartless add-on (including user scripts and plugins) to toggle its enabled state.

Rated 4 out of 5 stars (5)
40 users

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (8)
3,802 users

ViewAbout

Enables access to various about: dialogs from the View menu.

Rated 4 out of 5 stars (12)
3,595 users

WebPG for Mozilla

An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey

Rated 3 out of 5 stars (17)
3,369 users

xSidebar Featured

Firefox style sidebars for SeaMonkey...

Rated 4 out of 5 stars (11)
228 users

YouTube Anywhere Player No Restart

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

Rated 5 out of 5 stars (41)
40,566 users