In the "options" page for the Chrome extension there's a whitelist tab.

Does that whitelist the entire host? I would like to block everything but a specific JavaScript file on specific host. This is very easy to do with ghostery

> a specific JavaScript on specific host. This is very easy to do with ghostery

I don't see any feature to accomplish this with Ghostery. You can block hosts from its pre-built library of hosts, not more, and not at a higher granular level then whole hosts.

uBlock will report all hosts encountered on a page, not just those part of an internal database.

Perhaps, you should just switch to µMatrix.

µMatrix is sadly not available for Firefox.

"unblock resources" is too vague, can't provide an accurate answer.

You need to turn on advanced features if you want to do more than unblock everything from a site.