I can open pdf files in safari, however my office products work more effectively with Firefox. Currently the firefox browser shows a blank screen when I try to launch pdf file within my work program. So I would really like to be able to use firefox as the browser. Is there an update or fix that will work? Although I am currently on Adobe 10.1.4. after reading online discussions it suggests that 11.0 doesn't work either and so I hate to try another update. Everything was working fine with old Adobe version (which I don't know which one that would have been and not sure if and/how to get it back) until last Sunday when my husband decided to update my Adobe without my permission. Can anyone help?