Built in PDF reader is showing blank and then prompting to close firefox - Please help I am support a company who are really big on Firefox and love the built in PDF reader feature but recently when they open files they show blank and you ar then requested to close Firefox. Any ideas of what the problem could be? He has the latest version of Firefox from today I can see there was an update 2 days ago and there where some new features on the reader could this be the reason?