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The “rate limited” error occurs for me on MobileSafari on iOS, so it’s not Firefox related. Reloading the page works fine. It seems to have to do with which referrer took you to Twitter.

Firefox blocks third party trackers by default. In some rate limiting implementation, this often signals a bot that don't often retain tracker cookies.

Oh, so it could be my DNS-based adblocking setup or the “Prevent Cross-site Tracking” option in Safari settings. That makes sense.

That's actually Twitter's intentional behaviour to force users to log in.

Somehow you're no longer rate limited after signing in

I get this error in chrome/Android and rarely visit twitter.

Does that happen on chrome? I wonder what would happen if you swap out the user agent and have that issue.

Edit: It's working now just fine, even if I am not signed in. Like they suggest below, it seems like that is Twitter being actively malicious to web users, and not Firefox.