Color Palette Generator - Enter the URL of an image and find its color palette
VivaldiFox - An add-on that allows colouring Firefox in a Vivaldi style fashion
Color Hunt - Curated collection of beautiful colors, updated daily
automaticDark - Time-Based Theme Changer - Set Firefox to change the UI to a dark theme during the night and change back to a light theme during the day!
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.