Where does one find out about these random about:config values that don't exist by default? Thought I'd enabled all privacy.resistFingerprinting.* settings, but it turns out there's at least one that I'd never heard of. How much other functionality does Firefox have that is completely undiscoverable?
Search the addon store for "Privacy Settings", it does just that. It's a good way to quickly toggle privacy settings should they impact a site's functionality.
