I was an early adopter of Firefox 20+ years ago. It started going downhill more than 15 years ago and I bailed to Chrome when that launched. It really was better than Firefox at the time. Then Chrome got worse and I wound up back on Firefox, not because Firefox had gotten better in that time but because everything else had gotten worse than Firefox in the intervening time. Also, if going from 48% market share in 2009 to a barely relevant <5% in 2024 doesn’t count as a downfall I’m not sure what does.