Tor Browser 10.5 includes the addition of Snowflake as a default bridge option. Snowflake is a pluggable transport that uses a combination of domain fronting and peer-to-peer WebRTC connections between clients and volunteers to circumvent Internet censorship. Anyone can run a Snowflake proxy simply by installing a Firefox or Chrome web extension. Tor Browser also routes your traffic over the Tor network, encrypting it three times as it passes through volunteer-run servers around the world to your destination website.
Source: https://www.helpnetsecurity.com/2021/07/08/tor-browser-10-5-released/