By observing the HTML of the about:preferences#privacy page, we can find that the checkbox "Cookies" has a preference value of network.cookie.cookieBehavior, as does the dropdown next to it, so that's the preference value that is changed.
You can see in the console of about:preferences that if you type in Services.prefs.getIntPref('network.cookie.cookieBehavior') it will return a 1. You can also see this if you have about:config open as you are toggling the preferences dropdown - the value will change there.
I can’t believe I didn’t think about checking the html :) I also didn’t know that about:config updates in real time. I’d prefer to have a toggle like “changed items this session”, but this does the job too.
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