For ENS you can resolve names by just installing Metamask. The wallet part of Metamask is not easy to use, but if you just want to brows ENS domains I don't think it can get lower friction than that.

It does look like that exists: https://peername.com/browser-extension/

Why a browser add-on? That's a really bizarre way to do that and it only fixes interactive web browsing. There is a lot more to networking than web browsers!