It doesn't say anything about CORS in the networking tab: https://i.imgur.com/yeH6bGi.png

It correctly identifies that Twitter is trying to load a tracking site, which Firefox blocks by default (with an allowlist). Instead of hating on Firefox, hate on Chrome and other browser vendors that don't go to the effort of maintaining a blocklist to protect their customers privacy (or implementing support for an existing blocklist, in the case of Brave)

Do you work on Twitter? I'm confused why you would react so strongly and angrily out the gate.