There’s another option then, suspend all the cards that haven’t been seen yet, then set a reminder in a calendar app to unsuspend a card every 3 days. I know it’s a bit more cumbersome, but you also get more of a choice over the card you see.
From what I can see, the cards only tell you what to practice/play, and are not used to memorise anything, right? So accidentally seeing their contents in the browser while unsuspending won’t be an issue at all.