It's an Arc-Browser clone WIP which uses Firefox as base. It's everything I would want from a browser.

Pros:

1. Open Source
2. UI-First Approach means it's working towards a modern browsing experience like Arc
3. Firefox as base so all Firefox Extensions like Adnauseum/Ublock work on it
4. No threat of MV3. Arc has stopped blocking ads for me hence I will no longer be using Chromium at all. Adblocking works like a charm on Zen.
5. Highly customizable with a very fast development cycle.

Cons:

1. It's in Alpha so expect Bugs and less features
2. Still missing some features from Arc like Peek and Command Bar

I would recommend trying out this browser @ https://zen-browser.app/