"The true felicity of a lover of books is the luxurious turning of page by page, the surrender, not meanly abject, but deliberate and cautious, with your wits about you, as you deliver yourself into the keeping of the book. This I call reading."
Yes, so it does here, too. But a pop up is basically a small window. If it doesn't have a scroll bar, you could try clicking inside it and then using your mouse wheel or the arrow keys to scroll, or you could make the text smaller by zooming out: on a Mac, you press the minus sign while you hold the Command key to zoom out.