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 (172)
94,535 users
Updated July 20, 2016

Tab Numbers No Restart

Keeps track of your browser tab number.

Rated 5 out of 5 stars (5)
561 users
Updated July 19, 2016

Google Hangouts Web Messenger No Restart

Google Hangouts Web Messenger brings Google Hangouts right into your browser to chat with your friends.

Not yet rated
26 users
Updated July 19, 2016

Open With Vivaldi Browser No Restart

Open With Vivaldi Browser sends pages from Mozilla Firefox to Vivaldi browser.

Rated 3 out of 5 stars (1)
130 users
Updated July 17, 2016

YouTube Video Player Pop Out No Restart

YouTube Video Player Pop Out lets you pop out YouTube videos so that you can watch YouTube videos while you surf.

Rated 5 out of 5 stars (2)
648 users
Updated July 16, 2016

Open With Internet Explorer No Restart

Open With Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.

Not yet rated
4,494 users
Updated July 11, 2016

Open With Google Chrome No Restart

Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.

Rated 4 out of 5 stars (6)
11,787 users
Updated July 10, 2016

CuteButtons - Crystal SVG

Adds colourful icons to buttons and menus

Rated 4 out of 5 stars (103)
7,117 users
Updated July 8, 2016

GNOMErunner Options

Allows to customize GNOMErunner theme

Not yet rated
443 users
Updated July 6, 2016

Responsible Blocker No Restart

The "Responsible Blocker" arrives to save the Internet, this extension blocks all those annoying ads, but allows only small and acceptable ads, so the websites you like can continue online.

The "Responsible Blocker" arrives to save the Internet!

Not yet rated
4 users
Updated July 4, 2016

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (8)
16,825 users
Updated July 1, 2016

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 (150)
37,246 users
Updated July 1, 2016

Big Navigation No Restart

enlarging the navigation links on the pages

Rated 5 out of 5 stars (6)
739 users
Updated June 25, 2016

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (18)
2,096 users
Updated June 21, 2016

Add-ons Manager - Version Number No Restart

Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.

Rated 5 out of 5 stars (18)
1,526 users
Updated June 17, 2016

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (15)
3,938 users
Updated June 17, 2016

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.

Now Available for: Firefox, Thunderbird and SeaMonkey!

Rated 5 out of 5 stars (201)
61,025 users
Updated June 15, 2016

Restart Browser

Add browser-restart buttons and browser-restart menus to Firefox and SeaMonkey browsers.

Rated 5 out of 5 stars (1)
345 users
Updated June 7, 2016

jsbtn

JS on/off status bar button

Not yet rated
4 users
Updated May 29, 2016

Tategaki

Tategaki allows vertical writing-mode on mail compose window.

Not yet rated
14 users
Updated May 26, 2016