Tangential, but every time I read "macOS" in FF release notes, I hope that this fundamental bug gets fixed: https://bugzilla.mozilla.org/show_bug.cgi?id=1600153

Gist: You click a link (outside FF, say from an app), and FF opens 2 windows - one with the link and other blank. I have no idea how is this acceptable for a browser as mainstream as FF.