window.matchMedia('print') failing in Firefox and IE

Question

I have a print button that launches the print functionality on any webpage. The button hides as soon as the user clicks on it and shows if the user is done printing or presses c

Answer 1

You might want to look at the onafterprint event. At least this is triggered by Firefox and IE, so with a potential guard (to make sure the event did not fire multiple times) for your use case you can listen to both the matchMedia("print") and the onafterprint event.