I was going to say that unfortunately Vimium, Dark Reader, and 1Password support are non-negotiable, but the browser evidently has its own built-in dark mode, and they claim to support both Chrome and Firefox extensions as well?

I'm happy to provide non-Chromium traffic from either Firefox or something else; I'm increasingly running into things (often corporatey things) that only work in Chrome.

It also sounds like they use your icloud for syncing things like bookmarks and sharing tabs and use the built-in password manager, so if you're Apple-only this is a great fit. I hope the tab sharing will be more reliable than Firefox's has been.

Waiting until I can brew install, but looks promising.