I was mainly referring to how sluggish it was. For my web apps, it was always slower and the UI would bog down. Maybe not the correct definition of you refer to unnecessary features.
I am more referring to how lean or streamline the software is. Both in front end design and backend.
A lot of browser performance has to do with how you use it, so my experience is not universal.
Still, even full fat Firefox is skinny compared to the morbidly obese Chrome and edge browsers.