This is on Firefox Android / Nightly (20170318110135) STR: 1. Go on https://fr.m.wikipedia.org/wiki/Lignes_de_bus_RATP_de_100_%C3%A0_199#Ligne_169 2. Wait until the focus moves to the "169" part 3. Scroll horizontally with a momentum. => Sometimes it's not repaint at the end of the momentum move and stays blurry. It's not always easy to reproduce. Sometimes it happens right away, but sometimes it doesn't reproduce because it isn't blurry in the first place. I noticed the bug happens if: * there is a momentum * the move is stopped by the momentum end, not by hitting an edge. If the scroll hits an edge and stops abruptly as a result, then it's correctly paint.
What device are you using? The screen size might be a factor here. I tried reproducing on my Z3C but was not able to. Do you see this on any other URLs?
This is on a Z3C :) and TBH I think it's now working. Let's close it and I'll reopen if I see it again.