The Official Alexa Traffic Rank Extension, providing Alexa Traffic Rank and site Information when clicked
I use this all the time, it gives a rough and ready indication of site quality with its "rankings". It also allows you to explore similar sites and view other site stats. Pros: Indicates site quality in search results. Cons: Slows page loads.
Shows you site traffic and info about sites, which can be VERY useful when collecting data.
TEST