Hello, I login with tor browser
http://foxmixer6mrsuxrl.onion , I know tor hides my real IP, JavaScript will leak my real IP? What are the specific hazards of JavaScript? I want to know
Hi
JavaScript by itself will leak nothing. It always depends on its use on a specific website and your browser configuration.
If you enable JavaScript only for the foxmixer6mrsuxrl.onion domain (for example using the NoScript addon), then there will be no danger of any leakage.
If you configured your browser improperly, an IP leak may occur by a malicious use of specific technologies. For example WebRTC which builds up direct p2p connections. But also fingerprinting (identifying you by your specific browser instance) is a thing.
Many of these attacks can be mitigated by using the official "Tor Browser" bundle. The default settings in there are set up in such a way that the described attacks are impossible or at least very hard to conduct.
There is also "Tails" which is a whole operating system configured to enforce that all connections to go through Tor. This prevents leakage on the OS level instead of the browser level.
Again, these leaks are to be considered when browsing the web in general. FoxMixer JavaScript does NOT leak or try to leak your IP.
If you use the official Tor bundle + FoxMixer with its onion service and only whitelist "foxmixer6mrsuxrl.onion", you can get the best privacy results.