How browser products achieve PMF?

Google Chrome/Safari is an excellent browser for browsing and I've been using it for about 10+ years now.

I'm more curious to understand if there is an actual need for new browsers that Chrome/Safari are not able to provide or if it's just a TAM game where the focus of upcoming browser products is to cater to a specific audience.

Would love to know what's the thought behind coming up with a new browser product.