@TorATB i think that is a bad idea, now you just have to tap the arrow button if you would move it to a separate app it should be something like this: tap the three dots or other menu > share > select flow app which is less efficient.
i understand your idea that you want the freedom for your mobile browser. but the best way should be that opera makes a public API for flow so each browser can implement it like in opera touch.
BTW this will never happen 🙂