> I LOVED Arc.

I assume you've heard of it, but just in case you haven't: you should try Zen! It's basically Arc, but based on Firefox, open source and, more importantly, actively maintained.

https://zen-browser.app

Does Zen have multi-account container tabs? Edit: Yes, it does! [1]

(I need them partly because of Google, as Google has a broken login system. I use GGP at work plus a bunch of work apps that use Google for SSO. But for some products like Maps and YouTube, I use my personal account. Doing that on e.g. Chrome is painful, because every URL opens with whatever is your default login, and whatever I set as the default, it's usually wrong.)

[1] https://docs.zen-browser.app/user-manual/workspaces

And for those of us unfortunate enough to use Windows it is much more reliable and complete than Arc.