Vivaldi plus what?

I've been using Vivaldi for years, and was initially using it alongside Arc. Moving to my new laptop though, I've stopped using Arc for obvious reasons.

I am very comfortable with Vivaldi, and am not looking to replace it as my usual browser. It's slightly messy in a way that I like- Everything's at my fingertips, and things just work.

However, I do want another browser, the reason is plain weird- Vivaldi fills up with tabs I just 'need' sometimes, and I need to get away from the clutter. No, minimising the tabs does not work, I know they're there. Yes, I think I have an attention problem.

Anyway, I was looking at Zen and Helium.

Zen has the benefit of being similar to Arc, but a Firefox fork. It's been a while since I used Arc, but it might be fun. Another benefit, the vertical tab structure doesn't overwhelm me nearly as much.

Helium will be light, and less cluttered. Even though it might be a little too not cluttered, I really only need it to open some study related tabs in which I don't even need to log in, mostly.

Either of these browsers, I will log into only things I need for study/college work: google, github, courses I'm taking, etc.

Thanks!