Great job, very usable and performant. Restoring a tab keeps its history and position on the tab bar, which is very helpful.

Could you please add a function for opening a new tab? :)

I like it a lot.
It offers some of the functionality of Tab Mix Plus that I was worried about losing such as Duplicate Tab and Undo Close. It's easy to customize gestures and add new ones, and another good thing about this add-on is that it'll still work when Firefox 57 is released.

Thanks for developing it.