In 2026 the rules to making a good browser are (1) already be a trillion dollar company, (2) use Chromium, (3) have some form of distribution lock-in over billions of devices. Otherwise you're cooked. Mozilla swims against the stream better than anyone.
Take look at Ladybird
https://en.wikipedia.org/wiki/Ladybird_(web_browser)?wprov=s...
Ladybird will be dead in a few years.
I wouldn't discount ladybird or others simply because they haven't shipped their mvp just yet. They're closing in on a usable product. Maybe they never make it, but servo and others may. Saying they'll be dead in a few years isn't contributing much besides pessimism for anything but the status quo.
Besides, the one thing Mozilla could do to be relevant to 99.9% of web users is to move somewhere other San Francisco and turn their office their into a homeless shelter. They should go to Dublin or Frankfurt or Barcelona, anywhere.