Fontawesome icons don't show in firefox or vivaldi

I Need Help
1

just finished this site:

citiesinsync.ca

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?

2

works fine here.
Firefox, Chrome, CLIQZ, OperaNeon

3

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

4

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