You should not be inserting lake-draining spam machines into a browser that claims to want to make the web a better place. This is a deeply immoral and short-sighted decision, and your comments in this thread make you seem shockingly uninformed about...
This is a bad feature that should never make it to the main branch. It fills a huge amount of space, even on giant phones, to create buttons that duplicate behavior that either Firefox or Android already handles. It's completely pointless.