Firefox correctly syncs bookmark folders on both iOS and Android. Always has, as far as I can remember. What they doesn't support is putting your mobile bookmar

Firefox correctly syncs bookmark folders on both iOS and Android. Always has, as far as I can remember. What they doesn't support is putting your mobile bookmarks into folders on your mobile device; anything you bookmark on mobile lands in a "Mobile Bookmarks" folder. You have to either use tags or organize them using the desktop browser.