Firefox has so many great features and yet I find myself not using it as my main browser for a simple reason: New windows open twice as fast in Safari and Chrom

Firefox has so many great features and yet I find myself not using it as my main browser for a simple reason: New windows open twice as fast in Safari and Chrome. I'm opening a lot of windows because I'm not a fan of tabs. So Firefox feels extremely sluggish to me even though the actual rendering and JavaScript execution is anything but sluggish. I'm not even sure if Firefox windows open so slowly for a reason or if it's just a really badly designed animation.