Will this conflict with Genesis Extender?

Hi greggish.

I haven’t tested it with Cobalt Apps’s Genesis Extender plugin. Genesis Super Customizer mainly deals with the CSS of your site (with a few exceptions like the custom footer credits), and it looks like the Extender Plugin has a section for custom CSS as well. Theoretically, if you do all your styles in GSC and do everything else in Extender, that should work. But always test it out first.