Working almost fine.

However, gestures cannot be used on new tab or setting tab due to the limitation of Quantum API.
It really sucks because the behavior of gestures is not consistent with every tabs.

Wheel gesture stops switching tabs when it encounters a blank tab.
A blank tab cannot be closed casually with mouse gesture.
Such ridiculous behavior...

I think it's time to stop using firefox.
It was such a great update, thanks.