[firmgently]

I'm on a Note 3 (great phone, 5 years old) with a Snapdragon 800 vs your Snapdragon 805. Seems we both have 3GB RAM.

I do notice that links in FF are harder to hit accurately compared to Chromium - am guessing Chromium increases the hit area on buttons or uses some intelligence to look for the button closest to a touch... because it seems like it's just being forgiving on my sloppy touches (as opposed to FF being inaccurate). Admittedly a better UX in that respect regardless.

Otherwise I don't have any of these issues, FF is completely smooth for me. I wonder if you have some other software causing a problem, maybe FF add-ons?

(EDIT: I'm also on LineageOS 14.1 which is based on Nougat so maybe the sibling comment about Oreo is onto something)