Up until now (even earlier today) logging into Tumblr has worked perfectly. But I just tried to log in, and Firefox gave me this error:

The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

I've tried it with Google Chrome, and I get the same error. It only happens when I log into Tumblr, not when I'm logged out. Apparently, other users are getting this error too.

How can I fix this? Clearing cookies doesn't seem to help.

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