[gamer191]

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)