I keep hearing about how great Firefox is... yeah, maybe 10 years ago. It's sucked since about 2009 as far as I can tell. For years at a time Firefox would crash and exit any time Flash turned up on a site.
Not that Chrome is all that great either. Even idling in the background with just a few tabs it will knock 1/3 off my laptop's battery life. Also, really shitty memory management and background tab grouping. No, I don't care if google sees how perverted I am by tracking my viewing habits.
Brave isn't there yet for my needs on my Windows machines but I have high hopes for it. I do use Brave on my Linux boxes and it's better than anything else I've tried there.
The fundamental problem with the modern internet, though, is just shoddy web development practices. Breitbart loads like 40 scripts in the background. Other news sites are often worse. Plenty of sites are just terribly coded and will slam one of my CPU cores to 100% for 30 seconds every time I load a page without noscript. Shitty web developers who don't understand why it's bad to make calls to fifty different servers every time the site loads a page, or site owners who want infinite analytics but who don't understand how that affects performance? Can't say for sure. I doubt it's going to get better any time soon, especially with the proliferation of frameworks that have baked-in efficiency problems.