Firefox, something Firefox based or something entirely other?
There’s also Zen browser that’s Arc-like and based on Firefox instead of Chromium. Zen lets you sync tabs with Firefox elsewhere (including mobile Firefox), run the full uBlock Origin, and it is a fully open source browser.
It’s also available on Linux too (in addition to Windows and macOS), unlike Arc.
What’s the multi window feature in Chrome? Is that like containers in Firefox?
Sorry, I missed this comment until now. Thanks for the tip, I’ll check Zen out.
The multi window feature I mentioned in Chrome is for foldable phones. Chrome allows you to open two separate instances and have them on either side of your screen; much like you can do on a desktop. I love the multi tasking aspect foldable phones allow, but very few apps allow you to have two instances of them running like that.