Extension gives a rating that is fairly permissive depending on a number of criteria, but *not* whether it's left/right bias (a lot the the 'reviews' have not understood this) and clicking through will give you a detailed explanation for that rating. If you have a relative if gets their news from palmer report, american thinker, swivel-eyed loons on youtube or similar then this extension may well be helpful for them.

On the downside, there's no options to make the extensions less intrusive.