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In Gmail, the company is now displaying a rather innocent link that says "Get Faster Gmail" that shows up only for Internet Explorer users. But when clicked, that link takes you to a page promoting the download of Chrome or Firefox.
Digital Inspiration first spotted the ad and posted a shot of what it looks like:
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Of course, Google would prefer you download Chrome, but Firefox works too since it comes with Google as the default search. Nonetheless, "faster Gmail" is a fairly compelling reason to click the ad, so it's safe to assume Google will convert at least a few downloads from the effort.