Down load Firefox with 10S

Can we get more information and maybe a screenshot of the issue?

Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Do you need to use Windows in S mode ?

S mode allows exclusively running apps from the Microsoft Store and it looks that Firefox isn't one of those.

• https://support.microsoft.com/en-us/help/4456067/windows-10-switch-out-of-s-mode