Currently having the same issue. Attempted to open in both Firefox and Chrome to no avail.
The console had several errors in it:
Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' https://*.googlesyndication.com https://*.doubleclick.net https://partner.googleadservices.com https://www.googletagservices.com https://ssl.google-analytics.com https://www.google-analytics.com https://ajax.googleapis.com http://ajax.googleapis.com https://d3clqjduf2gvxg.cloudfront.net https://cdn.firebase.com https://*.firebaseio.com https://*.tokbox.com https://*.opentok.com http://static.opentok.com http://www.google-analytics.com http://cdn.crowdin.com https://crowdin.com http://stun.l.google.com". Either the 'unsafe-inline' keyword, a hash ('sha256-vtrwQ3JHAM2wk3ZRgzVLq2UE4HT/o7kDeTxKTsh5ewM='), or a nonce ('nonce-...') is required to enable inline execution.
gpt.js:1 Refused to load the script 'https://adservice.google.com/adsid/integrator.js?domain=app.roll20.net' because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' https://*.googlesyndication.com https://*.doubleclick.net https://partner.googleadservices.com https://www.googletagservices.com https://ssl.google-analytics.com https://www.google-analytics.com https://ajax.googleapis.com http://ajax.googleapis.com https://d3clqjduf2gvxg.cloudfront.net https://cdn.firebase.com https://*.firebaseio.com https://*.tokbox.com https://*.opentok.com http://static.opentok.com http://www.google-analytics.com http://cdn.crowdin.com https://crowdin.com http://stun.l.google.com".
After that it devolves into a series of connections timed out messages.