It's decent and has all the basic features. But there's a really frustrating thing about using this, every time you click the right mouse button for a gesture, it also brings up a context menu which you have to click out of. Probably not going to be able to tolerate this for more than a week and will uninstall as soon as I find an alternative (assuming that this context menu thing is not FF57 limitation that all mouse gesture addons will face).