Set Your Google Ads Preferences
I am using around 35 Firefox add-ons but none of them is for blocking online ads. I don’t hate them, even when I hardly pay attention to them and most of the time I have to use my poor dial-up connection.
With the launch of User behavioral targeting in Adsense, Google has given a chance to the end users to decide their preferences for Ad display.

If you haven’t blocked these ads, you can now set your preferences by visiting this page.
These options get saved as a cookie, that’s stored in your browser. You can always clear these cookies by visiting Tools > Clear Private Data in Firefox , or simply opt out from the same page to disable this cookie.
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Narendra.s.v Said,
Thanks dude for sharing this information. I tried it and got good results. My friend used a software which blocks all the ads on a site. I will tell him about this facility