As far as I know, using backspace to go back was something from Internet Explorer, which other browsers copied as a concession to users used to it, but only on

As far as I know, using backspace to go back was something from Internet Explorer, which other browsers copied as a concession to users used to it, but only on Windows. I've used Firefox for over a decade, and backspace never went to the previous page for me, even on a new install, so "every webbrowser for decades" is a stretch.