Yes its stable even with ublock origin addon. No crashes or freezing. (i used the regular ff84 universal version not the beta) but if you look at the forums we have speed tests already. but this dosent show real world perofrmance the best way is like i say test it foryourself
OK little update i have created a one minute test with Firefox 84 on Macbook Air M1 now you can see performance.. Its not the best because i am not a content creator.
Back in the day, when I had a 2014 Mid Retina MB Pro, Firefox would make fans sping like crazy (something to do with high res screens + Intel + Firefox), just opening. This one is running smooth as silk. What has been everyone's experience?