Greasy Fork is available in English.
Adds additional ratings (TMDB, Douban, Metacritic, Rotten Tomatoes, MyAnimeList) to imdb.com for movies and series. These can be activated or deactivated individually in the extension's configuration menu, which is accessible via the Tampermonkey menu. The extension also allows you to copy movie metadata by simply clicking on the runtime below the movie title.
< Feedback on IMDb with additional ratings
It seems like I didn't answer you directly, but Rotten Tomatoes is now there too.
Is it possible to add rotten tomatoes?
Also where can I find the configuration menu? some ratings I want to hide.
Great work btw!