They do have answers in Firefox. Maybe your setup is bugging out. I clicked through them, and all of them had answers.

Is Muse free?

Muse is available for free with a usage limit. If you reach your free limit and want more, you can upgrade to a paid subscription, or wait until your free usage limit refreshes.

Each of those FAQ headers is clickable and expands to show the answer.

I see answers.

That might just be from developers getting a Figma of a FAQ section without final copy, then Meta not doing adequate QA and shipping empty FAQ sections.