Hi there, I wrote a review for the Android version of Firefox after which I was re-directed to report the issue here. So for the last couple of months, I started to notice that Firefox (Android) lags/stutters severely when browsing through youtube, not watching videos, just scrolling through the video feed. Even after the page has loaded with all the videos, scrolling lags/stutters significantly, and it only happens when browsing youtube, haven't had this issue with any other site on Android using Firefox. I'm not using any extensions on Firefox in case that would impact it somehow. I've updated and also re-installed Firefox on my android phone in the hopes that it may fix the problem, but unfortunately it didn't. That said, I do use Firefox on my desktop, with plenty of extensions installed, and haven't run into this same issue with youtube. Android OS version: 7.1.1 Mobile: SM-J250F (Samsung Galaxy Grand Prime Pro) Firefox version: Latest Video preview of the lag/stuttering can be seen at the link below: https://youtu.be/zXBNmeC5IQY Kind Regards