Page Shot messing up on twitter

I love the idea of page shot, I make videos and thought i would use page shot for one of them. I tried to scroll down a twitter page and take a screen but it becomes a jumbled mess. The top bar moves to the center of the image (even though it was outside the box) and all the pannels end up under it. The reason for this is the fact it sometimes catches the corner of objects and assumes i want them in the shot. The other problem is the fact that your dashboard (status bar etc.) follows you on sites like youtube, facebbok, twitter etc, and atm you need to scroll to the bottom to download. Hopfully the screen shot will show what i mean.

Are there any keyboard shortcuts so this does not happen?

Screenshot-2017-10-5 Flat Earth Today ( FlatEarthToday) Twitter|470x500

I have seen this happen on a few sites too. Given that Firefox Screenshots is in beta, this should be ironed out soon. Glad that you published here though for the product team’s notice.