[npilk]

I feel like Arc nailed this perfectly with the vertical tabs and multiple "spaces", and since almost everything happens in-browser these days, this was 99% good enough. I can't understand why more power users don't find this setup ideal. I'm hoping Zen Browser can become a solid replacement.

[paularmstrong]

Zen has been working as a full replacement for Arc for me since the Atlassian acquisition. There are only minor things that I miss from Arc ("development mode").