Problem .. FireFox strips PDF file extension from file name when application option "Portable Document Format (PDF)" is set to "Save File" and when downloading a Fidelity Investment's statement or trade confirmation pdf document. When I attempt to download and save without previewing a PDF doc on Fidelity Investment website, Firefox does not save the file with the PDF extension. Which results in the file loosing its association with its appropriate viewing app. However if the firefox \tools\options\applications\"Portable Document Format (PDF)" is changed to either "Always Ask" or "Preview in Firefox" the problem doesn't occur. Or if the user right clicks the PDF link on the source html page and selects "save link as" the dialog box will ask to save the doc as a PDF and correctly add the PDF extension to the saved file name. This problem occurs with firefox 28.0 for windows and firefox 28.01 for android. The problem doesn't appear to occur with chrome or IE. However they don't offer a means to do a single click save.