I was just looking at my web stats and was presented with a Chrome advertisement at the top of the page. But I'm already using Chrome so what's the point in showing me an advert for it. That's just a wasted advert impression.
Google Adsense uses JavaScript to display each banner and there are a tonne of ways you can use JavaScript to detect what web browser the page is rendered in. So, why doesn't Adsense use this information when it displays an advert. An advert for Internet Explorer would have been much more valid - but wouldn't have made me switch my browser.
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