There are many comments from people wanting to pay for Firefox, but not to Mozilla.
As an independent alternative, the Ladybird browser (https://ladybird.org/) is being developed and could possibly benefit from more financial support.
Ladybird is advancing rapidly but I personally wouldn't use it as a daily driver yet. It's quite a small project in comparison to the giants like Chromium and Safari, but despite their talents and the from-the-ground-up approach free from legacy crap, it lacks a lot of functionality and performance enhancements for it to be a daily driver at the moment.
Give it another year or two and things may change, but if you daily drive it now you'll be either a beta tester or a volunteer part of the Q&A team.
Out of all the new and upcoming browser engines, I think the usability ranking is Flow, then Ladybird, then Servo, with none of them being a great daily driver yet.
Security is my top priority (even above privacy) when it comes to internet browsers. My impression has always been that browser technology is a very hard subject and incredibly difficult to do right. This approach is the main reason I keep a distance from any software that is not widely adopted. Even if it's innovative and novel. This being said: If I switch to ladybird today, am I a beta tester or is this a project I can count on?