This plugin looks great! On the other hand, I'm probably not in the target audience, because I've so far been surprised by exactly none of its rankings. I really appreciate the fact that NewsGuard is taking this on, and I'm hoping that more people start using it.

EDIT: I've read a whole bunch of the one-star reviews, and most of them seem to be angry, but most of them are angry about green labels for sites that display bias. I think it's important to note that bias is almost entirely irrelevant to the goal of NewsGuard. NewsGuard doesn't tell you whether sites are biased, just whether they're telling you the truth. This is why Fox news and CNN both get green labels: you may not agree with which stories they choose to carry, but they both generally adhere to accepted standards of journalism: tell the truth, and admit it when you get something wrong.