When I make my migration from chrome to Firefox # the feature I miss the most is the ability to go back one page using touch pad gestures like dragging two fingers to the right go back one page and this save a lot of time
Not only that but I think you could implement more features with gestures.
Quick update on the developing Swipe2Nav feature: We just landed a new animation style on Nightly that is currently being reviewed by UX and in testing with QA. All indications are go for Beta in x105.
The feature can be disabled via the pref widget.disable-swipe-tracker = true.
Advanced users who wish to customize the length of the animation can modify the pref browser.swipe.navigation-icon-move-distance to a minimum value of 1.
Please test it out on nightly or upcoming beta and post your feedback.