WebExtension (tested only in Firefox, until now) to add a link to the movie/tv show on the Netflix web app.
You have two ways to install the extension:
Install it directly from Mozilla Add-ons web site https://addons.mozilla.org/en-US/firefox/addon/netflix-steroids/
Or you can download the .xpi file from here.
The code is totally open, you can seek on it.
First, the extension extracts the title and year of the movie from the Netflix app. With the title, the extension requests a search in the IMDB web site and extracts from the response the IMDb-Id. That's made because, no matters the title language, the IMDb website returns a unique id. With the IMDb-id, the extension request a video key to TMDb. Finally, a link tag is added in the Netflix web app directed to the youtube video (the trailer). Yes, as dirty as practical!
☼ Feel free to use ☼
I prefer mate, by anyway...