All downloads are failed
I cannot download anything even a document or text file on my newly installed firefox44.0. It only showed failed in the "display the progress of ongoing downloads".
Alle antwurden (2)
It is possible that security software (anti-virus, firewall) is causing problems. Try to disable security software temporarily to see if that makes a difference.
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) to see if that helps.