Thread:Gameuser10/@comment-4614364-20150131185918

I think I know why it doesn't work for certain mods. If you take a closer look at the "Chat.js" page, I think only the users listed as chat mods could use the script. I'm not exactly sure if this is actually case, it's based merely on the fact that both you and Russ (who are listed as chat mods) are able to perform the script.

Just a theory. 