Addendum: The apparent scope of the icon is browser-wide, not limited to the current page. Since the "power on/off" icon is unqualified, it seems like clicking

Addendum: The apparent scope of the icon is browser-wide, not limited to the current page. Since the "power on/off" icon is unqualified, it seems like clicking it will turn the entire plugin on and off, not merely whitelist the current site.