while wanting to print with my MX320 canon printer error comes up (unknown error occurred while printing). the save the file as screen comes up and won't print. I phoned canon and the printer will work on IE and on a canon print test. I was then told to get a hold of firefox since it seems it is being blocked here. Just before the last thing I wanted to print I downloaded an email that was being sent to me, then this started. It is now happening every time I want to print on firefox.