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I use Firefox 4, but I still notice personal advertising.

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I use Firefox 4, choosed "let websites know that I do not want to be followed" in the Firefox options menu, but I still notice personal advertising. For example: I look for a holiday and the next moments several sites I visit offer me holidays advertisements. I thought that Firefox 4 dealt with this proplem, or am I doing something wrong?

I use Firefox 4, choosed "let websites know that I do not want to be followed" in the Firefox options menu, but I still notice personal advertising. For example: I look for a holiday and the next moments several sites I visit offer me holidays advertisements. I thought that Firefox 4 dealt with this proplem, or am I doing something wrong?

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The setting relies upon web sites obeying it. Currently most web sites do not.

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That certainly answers my question but it raises a new question: did firefox fool us a bit? That last question is retorical so you need not answer it. Thank you very much for answering my question!