I’m fairly sure they have made their browser the best at ad-blocking already.
But due to human nature, negatives like daring to remove some feature with minuscule usage gets heavily upvoted.
IME Firefox is much more of a battery hog on MacOS, Chrome's history page is much better, and some sites (Glassdoor and Google Meet come to mind) don't work properly in Firefox. And I don't really use the developer tools in either but I've generally heard that Chrome's are better. I still use Firefox as my daily driver but it's not flawless.
If Firefox made their browser the best at ad-blocking instead of performance (which also might go hand in hand) I would consider using it again.