Firefox GNOME theme is a CSS-based theme that makes Firefox adopt the visual style of GNOME's native applications.
The theme works by applying CSS modifications to Firefox's user interface to align it with GNOME's Adwaita design language. It achieves this through userChrome customization, allowing Firefox to visually integrate with a GNOME desktop environment without requiring changes to the browser's core functionality.
The tool suits users running GNOME who want Firefox to feel native to their desktop. It works best for those comfortable with CSS-based customization and aware that the theme uses unsupported Firefox modifications. Installation is straightforward through multiple methods: a dedicated graphical installer application, a one-command curl script, or manual installation scripts that can target specific Firefox profiles or detect multiple installations across standard locations, Flatpak, and Snap variants. For Arch Linux users, the theme is available through the package manager.
Development activity shows consistent maintenance aligned with Firefox's release cycle. The project maintains the master branch to support the current Firefox stable release, preserves compatibility with older releases through git tags, and provides separate beta and nightly branches for fixes applicable to pre-release Firefox versions. The maintainers actively engage with users through a dedicated Matrix chat room for support and discussion.
