A || (B && C) = (A || B) && (A || C) (hostname is empty || hostname matches regex) && (hostname matches regex or full page url matches regex) hostname matches ([xyz.gov](http://xyz.gov/)) || (hostname is empty && Full Page URL matches ([xyz.gov](http://xyz.gov/)))
A || (B && C) = (A || B) && (A || C)
(hostname is empty || hostname matches regex) && (hostname matches regex or full page url matches regex)
hostname matches (xyz.gov) || (hostname is empty && Full Page URL matches (xyz.gov))