- Minimalist ui that feels more native than firefox's (custom skin, not a rewrite)
- Replace some internal firefox components with better open source alternatives (e.g. uBlock origin)
- Remove mozilla's telemetry, ads and pocket
- Dot HQ's melon build tool, which was extracted from Dot Browser. They have been driving development of firefox forks and have made incredible progress.
- The BetterFox user.js tweaks, which are used throughout the browser.
- Firefox and the rest of the mozilla team.