The only thing I missed from the ordinary Firefox on Android was that Firefox used to have a brilliant hack with the sharing option where they would show the two most frequently used options (+ a sharing button to access the rest) instead of just one or just the sharing button.
This saved me a few seconds again and again and again.
Yeah, the sharing button thing is something I miss from the ordinary Firefox too. I usually share links with my friends through Whatsapp and its icon is hidden far to the right.
For me its been fantastic.