I downloaded Dropbox via Firefox and saved a document. I have my File Explorer set to open Dropbox files with Firefox. But … when I try to open my downloaded Dropbox file, Firefox opens, and I get a box that asks “Open File” or “Save File.” No matter which I click, a new screen opens with the exact same box, repeatedly. I have let computer sit, in case file was just loading slowly, but never does. I have uninstalled and reinstalled Dropbox several times, cleared Firefox cache, made sure my security allows downloads to Firefox. Can anyone help me? Let me add, the file in question is a family tree, and I was wondering if I might need to use something like Adobe Acrobat Reader as a third party location for opening this file. Thank you for any help you can provide.