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 (145)
91,728 users

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 (140)
41,259 users

QuickFolders (Tabbed Folders)

The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.

See new mail at a glance after automatic filtering - supports quickFilters addon!

Rated 5 out of 5 stars (109)
24,056 users

Old Default Image Style No Restart

Restores the default image style used for top-level images in previous versions of Firefox.

Rated 5 out of 5 stars (89)
12,068 users

Stylish Sync No Restart

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (19)
5,878 users

Drag-Select Link Text No Restart

Select link text with easy drag gestures.

Rated 5 out of 5 stars (16)
575 users

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 (115)
20,815 users

F.B. Purity - Cleans Up Facebook No Restart

F.B. Purity hides the ads, app spam and other annoying clutter from your facebook news feed, lets you increase the font size, change colours plus many more features and generally makes Facebook a lot less annoying to use.

Rated 5 out of 5 stars (73)
65,485 users

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 (90)
14,356 users

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 (38)
10,770 users

Right Links

This extension allows to open links in new tabs with right-click directly and using “long” left-click.
This is very useful for touchpads on notebooks and for mice without middle button.

Rated 5 out of 5 stars (107)
8,537 users

SeaTab-X-2

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (12)
1,387 users

lolifox - Fierr MOD

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

Rated 5 out of 5 stars (14)
4,348 users

Restartless Restart No Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 5 out of 5 stars (179)
44,460 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 (54)
33,800 users

Fierr

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

Rated 5 out of 5 stars (51)
3,275 users

IMAP Received Date

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (6)
1,489 users

Duplicate Tab

Duplicate Tab allows you to clone a tab along with its...

Rated 5 out of 5 stars (182)
1,154 users

Remember Mismatched Domains

The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...

Rated 5 out of 5 stars (66)
3,312 users

Customizations for Adblock Plus No Restart

This extension provides various customization options for the Adblock Plus user interface.

Rated 5 out of 5 stars (12)
22,040 users