[shaunol]

It is unfortunate that you are required to use the MS Store (sign-up required) to install Edge extensions. This is not a requirement of the base browser application itself. Chrome doesn't force you to sign-in to install extensions, why does Edge?

[MikusR]

I just tested on Windows 10 Home. You don't need to sign-in to install extensions.

[pawadu]

This is actually a good thing. It means Microsoft have the means to remove badly behaving extensions.

And no, you don't need to sign in (on PC, on mobile you cant event start the phone without signing in)