No, you do NOT want to browse using the .to extension. It is a gateway/proxy for accessing Tor sites without actually using Tor. In other words: not secure AT ALL. Whoever runs the .to proxy site has access to your IP address. In fact, their page itself warns: "By using this service instead of connecting directly to the Tor network you are trading off security and anonymity for convenience. Know that we can identify the IP of visitors using this service (but chooses not to). We strongly recommended to access Tor Hidden Services directly using the Tor Browser Bundle to increase your security and anonymity."