I have turned off all the add-ons and anti-virus, but the problem persisted. Even, if I download the same file in Android platform form Firefox I get same error. However, the Chrome don't show this error, to download files from this site I have to switch to Chrome everytime, which is very annoying, what could be the possible cause of this? If any information about site is required, let me know I can share it using developer option in Firefox. I have attached the screensnips of pop-screen when I click on the download button in the website along with the troubleshoot information. Please, help me with this! Thank You! :-))