firefox onPrintDialogClose and redirect not working

hi there
wonderful job - I really appreciate your work.

Just encountered a small bug

on FIREFOX ( latest version mc & windows )

printJS({printable:'dummy.pdf', type:'pdf', onPrintDialogClose: () => window.location='whatever.html'});

not working

if I click in the Adressbar and afterwards in the website
-> trigger is fired and reload is done

so somehow firefox loses the focus on the current window

Any help very appreciatet

My workaround this time
SetTimeout function .. fires after 11 seconds ( enough time for the users to print the socument )