Using Firefox - Opening .pdf file from web page results in error
"There was an error opening this document.
This file is already open or in use by another application."
Seems to be some kind of race - sometimes it opens but usually I get the above error. If I then click on the file in the browser downloads it opens just fine.
I just spent a couple hours talking to a very helpful support person in India and she was not able to fix the problem. Seems I will have to use a different browser or a different .pdf file viewer.
I am using the latest version of Firefox and the latest version of Adobe Acrobat Standard 2017 on a new Dell computer running Windows 10.
John Anholm shared this idea