For weeks now I have been unable to download pdf files that are either on the web or received as an attachment in an email. I get the message "Original file downloaded. Error:Could not contact server". When I look in the downloads in the top right hand side of firefox it shows the name of the document I tried to download and then "failed". When I look in the Windows Explorer download folder it is empty. I had been blaming "Zonealarm NextGen" but I just used Microsoft Edge and had no difficulty downloading both of the files (one from the web and one that was an attachment) that I could not download yesterday using Firefox. I hope there is a simple solution, as I hate to give up using Firefox. Appreciate any help. Thank you.