Firefox used to be amazing, but they squandered their market share with bad decisions and stagnation. Maybe one day they'll see the light, but not likely, given their recent ai additions...
Rumors of Firefox's death have been circling for at least 15 years now... somehow it's kept going despite odd incentives and bad corporate decisions.
They were competing with the biggest advertiser in the world who put an ad about their own browser on the front page of the biggest search engine in the world. Not sure it was entirely their own doing.