I am interested, if someone is seeing a difference. I am not sure, but after the first startup I had the feeling 31.0.0 was running really slow. I installed the classic mozilla theme on both, that makes it look like TenForuFox 3, with the tabs on bottom. I am not sure, if that is interferring. I noticed though, that this Classic theme (it is a different add-on for both versions) looks different. Also with 31.0.0 the three buttons on the top left (red, yellow, green, disappear or only appear half, cut from the bottom, if you open a new tab. So I switched back to 24.7.0. Maybe it's just imagination with me... about the usability of the versions. What do you say?