It's good, but unfortunately it can only prevent a URL being suspended for the current session, not whitelist it forever like The Marvellous Suspender (Chrome). This is really annoying when working through an infinite-scroll page like a YouTube channel, which loses its place when it gets suspended.
In case you didn't know, and for anyone else, Auto Tab Discard has a permanent whitelist. There's a menu option to add a domain to the whitelist, and you can also add regular expressions. It's also on the preferences page of course.
I understand. I also mentioned regular expressions. It's not as convenient as a menu option, but it's not too difficult and it works. For instance, you can add this rule to the whitelist to not discard any YouTube channel video lists: re:https://www.youtube.com/.*/videos
