Firefox for Android 社群討論區

I just got a new phone a couple of days ago. I am used to watching youtube on browser instead of the app for one simple reason: adblock. I set everything up the same way I had it on my old phone. But this one always needs me log in again after a few hours, which is a new issue. I already contacted youtube about it and they told me it's probably an issue with cookie settings. ...but I can't find cookie settings anywhere. All the tutorials are for older versions and simply don't work anymore!