This extension works by sending parts of a page's url to Fakespot.com so that the website can analyze the reviews on the page.  I have tried to cut down the information that is sent to the minimum required.  Here is what url information is sent:

Amazon:
    The domain name and product id, this will be the url path portion after either "/dp/" or "/gp/product/" until the next "/".

Best Buy:
    The domain name and product id, this is the number before ".p".

Sephora:
    The domain name and product id, this is the number after "P".

Steam:
    The domain name and app id, this is the number after "/app/" until the next "/".

TripAdvisor:
    The domain name and Attraction/Hotel/Restaurant url, this is everything after "*_Review-" until the next "/".

Walmart:
    The domain name and product id, this will be the number after "/ip/" at the end of the url path.

Yelp:
    The domain name and business url, this is everything after "/biz/" until the next "/".