It's not, might be adblocker or Firefox strict setting.
PS. This is indeed in Firefox with uBlock set to block all domains except for kizie.co, edgecastcdn.net and twimg.com.
Firefox strict privacy setting completely blocks twitter CDN urls, no way to fix it I suppose.
Thanks for taking the extra effort, appreciated :)
I'm in Australia. I see no errors in the developer console, or the network tab. Inspecting element reveals a bunch of divs, with no meaningful content (essentially empty) in the middle.