Firefox add-ons with "Design" tag

Take control of YouTube and boost your user experience!

Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

Changes the color of Firefox theme to match the website’s appearance.

Life is better in color. Make your browsing a little more joyful and vibrant.

Beyond dark mode for Google Docs

A beautiful New Tab page with many customisable backgrounds and widgets that does not require any permissions.

Life is better in color. Make your browsing a little more joyful and vibrant.

Life is better in color. Make your browsing a little more joyful and vibrant.

Life is better in color. Make your browsing a little more joyful and vibrant.

Life is better in color. Make your browsing a little more joyful and vibrant.

Life is better in color. Make your browsing a little more joyful and vibrant.

A wrapper for Chengyin Liu's WhatFont tool

Photo Editor and Search brings together simple editing tools and AI features. Generate images, remove backgrounds, enhance quality, and browse the web with Yahoo search, all in one clean, easy-to-use experience.

Automatically change Firefox's theme based on the time.

Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.

Purple Night Firefox Theme with Twinkling Stars, based on Chu's Purple Twinkle, but with New Tab Background, Sidebar Style and new Colors. Chu's Version: https://addons.mozilla.org/de/firefox/addon/purple-twinkle/

Life is better in color. Make your browsing a little more joyful and vibrant.

Save image as PNG, JPG or WebP by context menu on image.

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.

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

A modern dark / Matte Black theme with a red accent color. Click my name for more accents (request if not available).

Life is better in color. Make your browsing a little more joyful and vibrant.

An easy-to-use font inspector to get CSS styles of the selected element

My dark version of the Firefox logo.