VivaldiFox - An add-on that allows colouring Firefox in a Vivaldi style fashion
Color Palette Generator - Enter the URL of an image and find its color palette
ShadowFox - This project aims at creating a universal dark theme for Firefox while adhering to the modern...
Color Hunt - Curated collection of beautiful colors, updated daily
Firefox Color - Build Beautiful Firefox Themes
Material Palette - Generate and export your Material Design color palette