This is an Unofficial i2p Browser. It's made using the Tor Browser Bundle in order to take advantage of the hardening/attack surface reduction/settings management done by the Tor Browser, but it Does not use tor and it works differently than Tor. It is absolutely not endorsed by the Tor Project.
In particular, standard i2p does not enable isolation of connections by domain or by browser tab. This means that your identity is the same in every browser tab you are using. If a person owns two sites, and you visit both of those sites at the same time, it is possible for them to know. Keep this simple fact in mind when you browse i2p.