I'm able to reproduce this on two machines.
Desktop
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Error only shows up on localhost and not on https live site:
JavaScript: Enabled 
Browser version: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; InfoPath.3; rv:11.0) like Gecko 
IE version: N/A 
Can load include.js: Yes 
Defines localStorage: Yes 
Supports localStorage Yes 
Defines sessionStorage: Yes 
Supports sessionStorage Yes 
Defines postMessage: Yes 
Defines JSON: Yes 
Defines XMLHttpRequest Yes 
Supports XHRs Yes 
Persona onlogout called Yes 
Persona onready called Yes 
This is on IE 11.0.9600.16438
Windows 8.1 Pro 64-bit OS
Tablet
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Same error but on live site as well as localhost
JavaScript: Enabled
Browser version:	Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; Touch; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; Tablet PC 2.0; rv:11.0) like Gecko
IE version:	N/A
Can load include.js:	Yes
Defines localStorage:	Yes
Supports localStorage	Yes
Defines sessionStorage:	Yes
Supports sessionStorage	Yes
Defines postMessage:	Yes
Defines JSON:	Yes
Defines XMLHttpRequest	Yes
Supports XHRs	Yes
Persona onlogout called	Yes
Persona onready called	Yes
This is on IE 11.0.9600.16384
Windows 8.1 Pro 64-bit OS