I can't scroll when the cursor is on the very left of the screen.

In Opera, when I pop out a second video, it replaces the first one. It would be nice to be able to open multiple pop out windows as in Firefox.

It would be useful to have an option to make the video pop out window fullscreen by double clicking on it.

Allow multiple video pop-ups and make them fullscreenable with double click

Firefox has these features and I use Firefox just for them.