The browser now runs in a sandbox to block access to your IP address. The Tor browser’s 7. 0 version introduces a sandbox feature that, according to an interview on the Tor blog, should “make life a lot harder” for people using a Firefox exploit to discern the identities of a user. “It’s like Plato’s Allegory of the Cave,” Tor developer Yawning Angel said. “The only reality Tor Browser knows is inside of the sandbox (cave). We prevent it from interacting with the rest of your computer (the outside world), except via the Tor Network (shadows on the wall).”
See https://www.engadget.com/2017/06/09/tor-browser-7-0-sandbox-update/
Tor Browser 7.0 works harder to protect your anonymity on its own
The privacy-minded browser will keep your IP address safe by running in a sandbox.