By using this extension any user (not only the token contract owner) can transfer tokens from Ethereum to a chain with fast, inexpensive transactions (in this case the xDai chain) without deploying any additional contracts. The specified token amount is locked in the mediator contract, a new token contract is deployed automatically on the xDai chain, and the requested token amount is minted on the xDai chain. The reverse operation burns bridgeable tokens on the xDai chain and unlocks the tokens from the token contract on Ethereum.