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Chrome's ad blocker grabs items after they've downloaded and (briefly) displayed on the page, and then hides them.

Also, Chrome is still not available for my aging PPC.

I don't think it does that any more in recent versions of Chrome. There is an 'onbeforeload' event which can block the ads before they start loading.

FYI, if you're still using 3.6 (as mentioned in an earlier post) there is a fork of firefox 4 for PPC here http://www.floodgap.com/software/tenfourfox/ .