How can I display traffic info next to search engine results?

Question by Baba: How can I display traffic info next to search engine results?
For example, a plugin that, when searching Google for “Question and Answer websites”, will show Answerbag and Yahoo.com results with Alexa traffic ratings next to them. Or preferably, sort results by traffic statistics.

Best answer:

Answer by Sam
For Firefox = Alexa Sparky [Free]
-https://addons.mozilla.org/en-us/firefox/addon/alexa-sparky/

For chrome = Alexa Traffic Rank [Free]
-https://chrome.google.com/webstore/detail/alexa-traffic-rank/cknebhggccemgcnbidipinkifmmegdel?hl=en

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