AdDetector spots articles with corporate sponsors.
It puts a big banner on top of any article that may appear unbiased at first glance, but is actually paid for by an advertiser. The goal of this extension to increase corporate transparency for internet users.
"Native advertising" is a method of advertising that presents ads as journalism or unbiased articles.
This technique is used by publications like the New York Times, The Atlantic, Gawker, Buzzfeed, and others. Stories may be marked as sponsored, but disclaimers are subtle because the whole point is that users don't know it's an ad.
This extension requires permission to run on pages you visit, but your data is never used, stored, or transmitted. For those who wish to contribute or audit, AdDetector is open source: http://github.com/typpo/ad-detector