Recently switched to Helium, a super lightweight Chromium-based browser. It has vertical tabs, extension support, and tab groups and profiles, if that's what you mean by workspaces.

I was also a huge fan of Vivaldi. I’d recommend Helium or Orion (desktop only). People knock on Edge but it actually is a nice browser. When on a Windows box I don’t own I use it instead of Chrome. Edge has the best text-to-speech engine in reader mode which I reach for even on macOS on occasion. That’s the only reason I have it on macOS.

I found replacements for the Chrome extensions I was using and switched to Zen, which builds off of Firefox and closely resembles Arc (RIP).

It might not be the best security idea to rely on a relatively obscure browser like this, but I find it very pleasant to use.

Firefox generally has a lot of the same extensions. I use Zen browser (the OSS “arc-style” Firefox-based browser) on personal devices and generally like it a lot. It replicates a lot of what Arc did

Edge? You don't want the 'bloat' but you are OK with a browser siphoning all your info to M$ to be added to the borg entity.

+1 for Zen, its great

Firefox?