I followed the request / response through Fiddler and noticed that the property Content-Typeon your blob ( index.html) is set to application/octet-stream(which is the default content type for blob in Azure). It is for this reason that it loads, rather than being displayed in the browser, because the browser does not know how to deal with this type of content.

text/html, HTML- .
URL- Internet Explorer, ( , IE :). , IE, , ).