I never had twitter account (refusing to ack that child's efforts with renaming, just like most of the world), and I can see it on desktop on Firefox just fine.
Unsurprisingly, people have different experiences with sites like these that really want you to log in, but will sometimes allow you to view some content without logging in, as a way to entice you.
Could be something about my uBlock Origin, but I'm not taking it down for anyone.
I've also never had a twitter account.