When I pull upwards on the bottom of my screen to scroll between/close apps while in landscape mode (such as watching a video or playing an app), if Firefox is open it will show me a preview of a video that I watched a while ago (and in a private browser, as I do most of my internet usage in the private browser). Why is it doing this? I've since watched other videos, and yet it still shows the preview of a video from several weeks, if not months ago. I'd like it to not do this. It's a bit annoying seeing this glitch (or occurrence, however it may be categorized) so often when I'm long since watched other things. It's only occurring when in landscape mode as well.