A couple other Mac users reported an issue with downloads having .fileloc at the end. Those thread are still in discussion and do not appear to be solved. Some of the back and forth still might be useful: * [https://support.mozilla.org/questions/1159350 .fileloc] * [https://support.mozilla.org/questions/1160083 After latest Firefox Update, downloaded pdf's show "@ File" instead of a thumbnail of the document- how do I change this?]

Here is one of the posts here; https://support.mozilla.org/en-US/questions/1159350