Google giving different serps in mozilla from IE

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I'm only just hearing about this. Apparently Google have been
experimenting with giving cached serps to mozilla browsers and normal
ones to IE and shells.
No wonder we get different results on here sometimes.
I wonder if that was what the recent "Google caught cloaking" was all
about? I didn't grasp it at the time. I'm not entirely sure I do now,
to be honest. Skewed results are being given out, either way.
Anybody's logs shown a sharp increaee in Mozilla visits lately, over
and above the expected from FF?

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