I just installed Firefox on my iPhone and can't seem to sufficiently customize the homescreen. Specifically I can't find a way to delete 'Amazon sponsored' and 'Expedia sponsored' from the buttons that appear. I don't have use for these or any other corporate sponsored buttons and don't want to see them. My goal is to take better advantage of syncing to Firefox for Mac, and these buttons seriously interfere. It's also not letting me change the order of the buttons to better match my laptop screen. Please advise.