Радик, читаем по приведённой ссылке
appName property (Internet Explorer):
Цитата:
appName property
Retrieves the name of the client.
Syntax
JavaScript
p = object.appName
Property values
Type: String
Microsoft Internet Explorer
Returned by Internet Explorer 10 and earlier.
Netscape
Default. Returned by Netscape Navigator, Google Chrome, Mozilla Firefox, and IE11 Preview.
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