There is an "Allow all blocked for session" button on the extension that will usually get the site loaded for you with one click. You can also go to the extens

There is an "Allow all blocked for session" button on the extension that will usually get the site loaded for you with one click. You can also go to the extension options and white-list the domain(s). You can use wildcards there so you don't have to type all the relevant subdomains (e.g. cdn.example.com would be included with a *.example.com whitelist entry).