Please don't use Vivaldi. It's based on Chromium, whose curator is Google. Chromium is open sourced, sure. But Google still has the keys to the repo and they do push whatever they want to push on there.
But can't someone just open-source chromium if stuff goes out of hand? Technically, sure. But developing a browser takes a crazy amount of resources. Maintaining a fork like this would be expensive. No one really has the resources for this.
This is why you probably should use a Firefox based browser. Mozilla, the parent company behind Firefox is still American, though it's a non profit. They kinda have the resources to maintain a browser. Granted, there are many problems with Mozilla. Regardless, it's still much much better than Google.