(I have no idea where this should be posted because there are a multitude of categories for posting.) I cannot print/save PDF or save HTML files from FF version 56.0.2 (64 bit) if I select any folder assigned with “Controlled Folder Access” in Virus & threat protection settings of Windows Defender Security Center. I use Windows 10 Pro Version 1709 (64 bit). When I try to save the file and give it a name, FF tells me it cannot find the file, as if it assumes that I am trying to open an existing file instead of saving a new one.
However, I can save these files to another folder, one that is not set with Controlled Folder Access. In addition, this problem does not occur when I use the Edge browser doing the same function into the protected folders, only with Firefox.