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Stylish - Custom themes for any website
Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.
252,987 users
Greasemonkey
Customize the way a web page displays or behaves, by using small bits of JavaScript.
643,943 users
Tampermonkey
Tampermonkey is the world's most popular userscript manager and has over 10 million users.
132,551 users
Violentmonkey
Violentmonkey provides userscripts support for browsers.
20,463 users
Access online for SeaMonkey
This extension is the SeaMonkey online
71 users
Text Contrast for Dark Themes
Fixes low-contrast text when using a dark desktop theme.
2,713 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.
73,276 users
Emoji Keyboard
A free extension of the web tool https://emojikeyboard.org. It helps input emoji in the web browser with an extensive search functionality.
59,840 users
Dark Theme for YouTube™
A Dark and Smooth Theme for YouTube™.
6,703 users
Dark Theme for Google™
A highly customizable dark theme for Google products (search, images, translate, and contacts)
7,222 users
Seamonkey
5 users
Keywords Everywhere
Install this keyword tool add-on to view useful keyword search volume, CPC & competition data on 15+ websites like Google Search Console, Google Analytics, UberSuggest, Majestic, Moz Open Site Explorer, YouTube, Amazon, eBay, Bing, Etsy and more
6,500 users
Dark YouTube Theme - Black Skin for YouTube & FB
Dark YouTube theme - apply Black Youtube & Facebook Skin. Dark YouTube theme protects eyes by changing Youtube & FB colors to black
29,863 users
Dark Purple Youtube Theme
Makes the layout of Youtube Dark Purple while retaining the original feel.
2,391 users
Eco theme
28,055 users
Keybase
A secure chat button for every profile.
1,096 users
Shortkeys (Custom Keyboard Shortcuts) for Firefox
Easily customizable custom keyboard shortcuts for Firefox. To configure this addon go to Addons (ctrl+shift+a) ->Shortkeys ->Options. Report issues here (please specify that the issue is found in Firefox): https://github.com/mikecrittenden/shortkeys
1,778 users
SeaMonkey Modern LW
24 users
DuoKeyboard
Adds automatic keyboard selection for duolingo.com based on user preferences.
500 users
YouTube Dark Theme
A highly customizable dark charcoal/blue theme for YouTube
1,120 users
Containers Theme
Changes the current browser window theme to match the colour of the active Container Tab. This increases the visibility of normal containers: https://addons.mozilla.org/en-us/firefox/addon/multi-account-containers/
362 users
Dark Twitter Theme
Make Twitter eye-friendly at night!
504 users
vimkeybindings
Vi(m) directional keybindings for Firefox.
199 users
F-Secure KEY
Fill login forms on web-sites using credential, stored in F-Secure KEY application. Doesn't work as a standalone add-on without F-Secure KEY installed. For more information visit https://www.f-secure.com/key.
1,415 users
Темная тема для ВК | Dark theme for VK
Дополнение изменяет стандартный дизайн социальной сети ВКонтакте со светлого на темный.
1,739 users