[commonbullet]

The appearance is definitely more like Chrome, even the Web Inspector. I guess they are trying to make the look and feel more coherent among platforms (desktops, mobiles, etc). Still it’s not quite like Chrome IMO.

Usability (despite the new “hamburger” menu), rendering (something changed on some fonts sizes, but I guess it's related to markup), plugins, etc - is still Firefox; also it looks better on OSX than the previous version, maybe except for the tabs corners being too rounded.

I've been using Firefox eventually for development only, though.