FWIW, I'm genuinely unsure where the "Firefox is bad" narrative comes from. I use Firefox as my primary browser across Android, MacOS, Windows, and Linux (KDE) and have not had any significant trouble with that setup in years outside of an occasional hiccup with a Google property. Mozilla acts like an ADHD squirrel and can't seem to help but burn through their market share, but for all the terrible management and business execution the engineers at Firefox have been consistently improving the product.