FirefoxCSS Hub

Published theme

FF Ultima

The Firefox theme with too many options

Open original repository
Repository
github.com/soulhotel/FF-ULTIMA
Stars
1,168
Last update
Feb 16, 2026
Submitted as
legacy
FF Ultima screenshot

Tags

adaptivecustomizablemodernmultiple layouts

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.