In Chrome, detaching a tab is a smooth animation. The new window made from detaching the tab is clear, and your mouse never "drops" the tab if that makes sense. In Firefox, the experience is more jarring. If this tab detach experience was smoother I'd be using FF instead of Chrome for the majority of my browsing.
Please see screen recording for what I mean: https://youtu.be/6UBxlbNe8Xw