Two questions: Is this the reason that scrolling left and right in firefox now goes back and forth in history? Or is this something firefox on its own thought

Two questions: Is this the reason that scrolling left and right in firefox now goes back and forth in history? Or is this something firefox on its own thought would be a great idea? And why is sway listed in this? Isn't the whole point of using sway to do most, if not everything with the keyboard?