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ipleak.net relies on using a specific js draft spec that is breaking with previous (and established) ECMAscript standards. The problem is that trailing commas in argument lists and arrow function arguments are not allowed in standard specification JS. Only the non-finalized draft spec for ES2017 allows trailing commas. Browsers which adhere to finalized standards will therefore have a lot of page elements missing on ipleak.net due to the following errors: SyntaxError: expected expression, got ')' index.js:129:12 ReferenceError: IpLeak is not defined ipleak.net:38:0 Please remove trailing commas. Not only is it nonstandard, it's also very sloppy.
This is an excellent talk about current fingerprinting methods that don't need to rely on cookies or user agent strings. It also sheds light on how ineffective certain kinds of "privacy-enhancing" addons are at spoofing user-identifiable information - in some cases they even increase the risk of being uniquely fingerprinted. Link to video at SecurityTube.net: http://www.securitytube.net/video/8943