After the recent update to Firefox 57.0, I've been having an issue concerning YouTube's Autoplay and Subscription view cookies not being saved within a single Firefox session, let alone multiple sessions. After a few hours (I am not sure how long it takes, I have not checked), the settings I have for Autoplay (the blue slider on the "Up Next" list of videos) and the view on the Subscriptions page (Grid vs. List) reset to YouTube's default settings (Autoplay On and Grid View). Aside from the update to 57.0, I have only switched from using Adblock Plus to uBlock Origin. I've tried to disable some of the filters that are in uBlock but were not in Adblock but I am not sure which is the culprit, or if it is an issue with either Firefox or YouTube instead. I cannot seem to find anyone with similar issues except for one thread on Reddit but I'm not even sure if the poster there and I have the same issue. Edit: I've switched back to Adblock Plus from uBlock Origin and the cookies are still not saving properly. It does not seem to be related to either of these add-ons.