FirefoxCSS-Store

Published theme

Cascade

A responsive "One-Line" theme based on SimpleFox for the new ProtonUI. Compatibility: V91+

Open original repository
Repository
github.com/andreasgrafen/cascade
Stars
1,594
Last update
Oct 2, 2025
Submitted as
legacy
Cascade screenshot

Tags

andreasgrafendarklightminialone-lineonelineprotonresponsivev91

Install overview

  1. Open the original repository and read the maintainer's installation notes.
  2. Enable toolkit.legacyUserProfileCustomizations.stylesheets in about:config.
  3. Create or open the chrome folder in your Firefox profile.
  4. Copy the theme files requested by the original repository and restart Firefox.

Ownership note

FirefoxCSS-Store indexes this submission for discovery. The code, license, support, and installation details belong to the original repository.