Same experience for me. I have FF installed on my laptop as a second/backup browser. I use it once every few days. First time after I installed it I have got a notification that it is launching slow and I should consider removing add-ons. This was the first time I ever launched it. It constantly freezes and makes my laptop look like an oldie, even when it's not.

Chrome for me any day. I prefer to have ram clogged and no freezes.