Hello

I just noticed on one of my forums that AdSense uses a mouseover effect in AdSense text ads when viewed with IE 9. I never saw this with Firefox so I can't really tell if this behavior is a small test or a large scale behavior change.

I find it interesting though.

Here is a screenshot with the mouseover effect

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Have you seen this behavior in FireFox as well?
What do you think about this? Good or bad?