I don't know what you mean by emulation codes. If you are looking for screen resolution and user agent string for the relevant Microsoft browser (to enter as UA), you probably can find those in a search for a representative device and "user agent".

Thank you for your prompt response. I followed the link and tried several of the UAs. Some of them partially worked. I was able to get to the first drop down selection on the web page, but not the second. Here: https://www.microsoft.com/en-us/software-download/windows10

Let me explain what I am trying to do. I have to use windows phone emulation in IE11(F12) to get the proper screen to directly download a Windows 10 iso file, otherwise I have to download with the Media Creation tool.

I am trying to reproduce this with Firefox.

My request may beyond the scope of assistance you provide.

In any case, it would be helpful it this option were added to the device selection, without having to build it.

Thank you.

You can propose changes to the Developer Tools on this forum:

https://discourse.mozilla.org/c/devtools