After I have installed Tails I tried to open Tor browser from Tails but first I got the message that Tor browser was not yet ready. After I tried to open it anyway (as the option is provided) I got the following message:
The proxy server is refusing connections. Firefox is configured to use a proxy server that is refusing connections. - Check the proxy settings to make sure that they are correct - Contact your network administrator to make sure the proxy server is working
I have no Firefox installed on my computer.