I don't remember firefox being the best browser anytime in history, I don't remember firefox becoming slow over time either. I do remember opera being years ah

I don't remember firefox being the best browser anytime in history, I don't remember firefox becoming slow over time either. I do remember opera being years ahead of all major browsers and being copied right and left and I also remember most major browser (not IE) having similar performance. Maybe it's the web pages that have become more and more bloated with useless tracking, ads and scripting a.k.a. web 2.0