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As soon as the rendering engine is switched to IE the OS and browser is identified, of course. User agent switcher or overrider has no effect, which limits its use. Would very much like to see support for user agent switching..

Это отзыв для предыдущей версии этого дополнения (0.3.5.1-signed). 

Some websites send different pages for different user-agent strings. IE engine should be fed pages that designed specifically for IE, thus overriding the user-agent will only break its compatibility.