FirefoxCSS Hub

Published theme

Proton Square

Recreates the feel of Quantum with its squared tabs and menus. No rounded corners to be seen. Compatibility: V91+

Open original repository
Repository
github.com/leadweedy/Firefox-Proton-Square
Stars
135
Last update
Mar 12, 2025
Submitted as
legacy
Proton Square screenshot

Tags

leadweedypurequantumsquaredv91

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