Custom font not loading in Firefox

Hello,

I'm designing a website using a custom font and it doesn't work in Firefox. The font is loading fine on other browsers (Safari, Brave, Mobile Safari) but not in Firefox.

It displays the following alert:

downloadable font: download failed (font-family: "Dwight-Bold" style:normal weight:700 stretch:100 src index:0): bad URI or cross-site access not allowed source: https://static1.squarespace.com/static/…

Also:

[HTTP/2 403 Forbidden 302ms]

And:

CORS Missing Allow Origin

I can't figure out what's wrong. I'm using Squarespage CDN (https://static1.squarespace.com/static/6…) and what makes me mad is that it works elsewhere…

Website: https://helix-oarfish-k7lx.squarespace.com/
Password: hellothere

I'm all ears for any suggestion to fix this. 🙂 

Loris

EDIT: maybe it's because I'm currently password protected… I tried by loading a font on another (public) site and it didn't work either…

Sometime upload files wont' work on Trial Plan. I tried clicking on font file, it shows blank page