User blog comment:DaNASCAT/Technical Update: May 6, 2015/@comment-24409505-20150509101641/@comment-1251315-20150510151511

@Dessamator: CacheCheck can be used Site Wide, but it's not recommended as there is no in-built check to see if it's already loaded. You would have to create your own conditional code to prevent it loading multiple times for users who have it in personal JS.