I can't download any type of file since yesterday, didn't change anything. Files just 'Fail' when i click download, they didn't even start downloading. I already tried Safe mode, uninstalling Antivirus (Kaspersky), and everything of this article: https://support.mozilla.org/en-US/kb/cant-download-or-save-files Here are some examples, tried to save facebook images and failed, same to 'Malwarebytes' launcher.