Abandoned for now as I don't currently play WoW. The addon's not very complex so it will probably keep working for a long time if you enable out of date addons.
JSAS lets you shut off or enable Blizzards Spell Alerts on a per character/spec basis instead of having to adjust it manually every time you log in.
IMPORTANT: This does nothing to the spell alerts opacity, if you have this at 0% you will never see the alerts even if they are enabled.
/jsh will hide the alerts for that character/spec /jss will show the alerts for that character/spec /jsas will give the full list of slash commands.