This is a Chrome extension that adds two features to Letterboxd. You can see the Metascore & color and a button added beside the IMDB and TMDB micro-buttons at the bottom that will link you to the film's Metacritic page.
Prefer Rotten Tomatoes? I have a Chrome extension for that as well, view it here.
To install this, simply click "Add to Chrome" on the Chrome Web Store.
Link: https://chrome.google.com/webstore/detail/letterboxd-metacritic-add/gkfbajagaabdkcihefomfmgjkdgkgdck
First, clone the repository.
Second, grab an API key from The Open Movie Database's website. Set OMDbAPIKey on line 1 in content.js to your API key.
var OMDbAPIKey = "YOUR KEY HERE";Next, you need to load the unpacked extension. In Chrome, visit chrome://extensions/. Click "Load unpacked" and choose the directory of the repository. It should now work.
Feel free to follow me on Letterboxd. :D