Cari, who is a developer on our SEO team, just wrote a Chrome extension that's up on both github (https://github.com/wayfair/nofollow_highlighter) and the Chrome web store (click here to add to Chrome). If you don't know this subject matter, here's a classic explanation from Matt Cutts of Google, from a few years ago: https://www.mattcutts.com/blog/pagerank-sculpting/. A lot has changed in SEO since then, but this basic idea has become a constant in internet life: if you're compensating people for a promotional activity, they need to make that clear to Google with a 'nofollow' link. Here's an example of a blogger who is doing it right, with a disclaimer saying she was compensated with a gift card, to keep the FTC happy, and a 'nofollow' link with the yellow highlight from our plug-in, indicating that the link properly warns Google not to pass page rank, or whatever they're calling 'Google mojo' these days, through to the destination. The other links on the page don't show up color-coded one way or the other, because they go to domains we don't care about.