That one costs money. Is there a free blocker? I use Firefox Focus, but it does not let me add custom elements.
www.reddit.com##.xpromopill
www.reddit.com##.active.xpromopopup
www.reddit.com##.amp.snackbar
www.reddit.com##.navframe > .xpromominimal.dualpartinterstitial
www.reddit.com##.xpromoadfeed