I'm running firefox 9.0.1 on a Mac (Lion). when downloading PDF files I get the "What should firefox do with this file: open or save'. i have ticked the box to indicate that it should open the file with Adobe Reader and that it should do this automatically for files like this from now on. Firefox recognizes the file as an Adobe PDF document and my Preferences > Application settings identify Adobe Acrobat as the application to open those file types. Any thoughts?