You will need to install a user script manager extension to install this script.
Displays third party seller name, country of origin and ratings on Amazon's search result page and bestsellers page. Also highlights sellers from specific countries (Default is China and Hong Kong, but can be set for anything).
Seller infos come with a slight delay after page load, so be patient. Also Amazon seems to block access to seller pages after some requests, this is not this script's fault, it's Amazon (You can see the 503 errors in the console). In this case only the seller's name is displayed but at least you still can differentiate between 'Sold by Amazon' and 'Fulfilled by Amazon'. Product pages are not affected by this restriction and can be accessed anytime. The restriction to access seller pages is removed after a few minutes.
This is my second script, so if you find any bugs or have improvement ideas, feedback is welcomed!