cannot print without a "save print out put as" box comming up, this is new since the last firefox update

Since the last update of firefox, which has been really useful in blocking popup's, I cannot print anything e.g. an email or banking information without a box entitled "save print output as" with the usual file name and location information lines. I do not want to do this and have never had to do this before, also when I close the box a "Printing error" box appears and I cannot print.