oleh flod (Pengembang) pada Juli 15, 2015 · tautan permanen

Are you sure you're commenting on the right add-on? Because I have no idea how a single website relates to it.

EDIT: oh wait, "spoiler" as in tag, not "spoiler.it". I'll consider it (need also to figure out how frequently it's used), for now it's definitely possible to use a custom tag.