Well... I know it's chromium, but I have to admit Vivaldi is easily my favorite browser. It's got a bunch of fairly unique features that I just can't live without. It's got tabs within tabs, tab tiling, a whole side car for websites that you can display while working on whatever Web page you need (works great for social media, music, messaging). I don't have a link, but maybe worth checking it out.
Fair enough. I'm relatively sure that Vivaldi does the same freezing, however I haven't seen documentation around it and I'm too lazy to look it up. I can say that tabs that haven't been used in a while reload entirely when you switch to them.
But I do like Firefox's privacy. Limiting cookies to only cookies from that website is a nice touch.