Yep, the issue was the name of the cursor I wanted to use. In looking through the accepted styles I actually want “pointer”.
@PGriffith I blame you! In the solution to another one of my questions you put the word “hand” into my head. And when I tried it in the designer it actually worked!
It seems that in the designer there is some alias from “hand” to “pointer” that doesn’t exist in the browser that I am using.
@andrews At the top of my post I listed the browser that I am using - Firefox 99.0.1