ZenFox автор CodeCadim

This is a fork of ArcFox intended to minimalism's lovers.
Expect less features, less buttons and less functionalities.

After installing this add-on, you need to install the userChrome.css (see instructions on https://github.com/CodeCadim/ZenFox)

If you prefer the original that aims to resemble Arc Browser, project is here : https://github.com/betterbrowser/arcfox