I am running Tails Version 0.22, and I have noticed that the Tails home page sometines loads before Tails. I am led to conclude this because the Tor icon is still yellow and it shows as still loading and the control panel shows the same when I check it. Why is this happening, how can I prevent it, and what kind of new vulnerabilties is it creating?
The firewall is loaded early in Tails boot sequence. So no connections are possible without Tor. What you describe is only an artifact (a race) on how Tor and Vidalia reports their status.
Since Tails 0.22.1, Tails do no start the web browser automatically and only shows a notification.