NOTE: My script (below the line) was a simple workaround, for more/better MidJourney functionality with TamperMonkey, check out MidJourneyTools from Emperorlou:
MidJourneyTools https://github.com/Emperorlou/MidJourneyTools
I made a Tampermonkey script to batch download images from MidJourney.com.