Fontawesome icons don't show in firefox or vivaldi

just finished this site:

The fontawesome social icons used on the about page show in safari, but not in firefox or vivaldi. Don’t have chrome so didn’t check that one. What gives? Do i have to resort to just using images?

works fine here.
Firefox, Chrome, CLIQZ, OperaNeon

you mean you see facebook and twitter icons on the about page? If so is my ad-blocking catching them somehow maybe? Weird.

I see all icons.
No idea why you can’t.