ZenUnderrated
A calm Firefox-based browser with workspaces and vertical tabs.

Best for
Firefox users who want an Arc-like workspace model without Chromium.
Why it deserves attention
Zen builds on Firefox and adds workspaces, vertical tabs, split view, and a compact mode that hides chrome until you need it. Themes and mods let you reshape the interface, and the whole thing is open source. It is still a relatively young project, so occasional bugs and extension compatibility differences are part of the deal.
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