I get green.
Stop lying. It is always yellow with 10 minutes (until your Tor identity is changed).
I'm not lying, see subsequent screenshot. Now, all I get is red (with the first 3 octets the same as the exit node) - it's actually quite hard to trigger a green one again (but I did: so there)
The interesting thing (I guess) is that when I got green, I have no idea where the IP address comes from: it's not from the guard, hop or exit (and it's not my real IP either)
Edit: my bad, I didn't read the description properly, and looked at the IP, first colored field
When it's yellow, I don't know how they could tell that the session will last for "10 minutes". Probably they just recognize the IP as coming from Tor, so they assume that the circuit will exist for 10 minutes. And the red with "Unlimited" just means that they didn't recognize the IP as coming from Tor.
Anyway, in the case of Tor Browser, this is not really meaningful as we are isolating websites by using separate circuits, so an open http session cannot be used to track a user across websites.
So I think the "http session" in red is not a bug on our side, but an issue on their side detecting that the IP is a tor exit node.
Trac: Status: new to closed Resolution: N/Ato not a bug