so... while i was buying like 10 things, i was a bit tired of the confirmation window popping up every single time.
if you are using firefox, it will ask if you no longer want to see the window. so, naturally, i said yes, to avoid seeing it again and slowing down my purchasing. well... this lead to me being unable to purchase from the marketplace at all without confirming the purchase every single time.
in my attempt to fix the problem by re-enabling pop-ups again, it seems to still not work... the pop-up won't reactivate and now i am locked out of purchasing from the marketplace...

@tomo If you close and reopen your browser it should go back to normal - this has worked for users in the past at least.

@squid
thank you! that worked!!!