Because the Tor network guides its users through a variety of different communication interfaces, so-called proxies, in order to disguise their location and identity. In this way it becomes possible to circumvent the censorship measures of totalitarian governments.
The Tor network is best known for providing access to the much-discussed dark web, which has gained notoriety for its black markets and other shady sites. What is all too often ignored in this discussion, however, is the fact that in many parts of the world the network is the only way to gain access to the free and uncensored Internet.
The Tor network thrives on the largest possible number of proxies. The Snowflake extension for Firefox and Google Chrome configures your Internet access to a proxy while you are using your browser. In this way you can contribute to expanding this network.