Simple browser extension that adds trailers to Plex* movie pages.
Your library is not modified in any way, the plugin just adds a link to the trailer on youtube. If you already have local trailers or other extras they can be supported in the Plex client natively: https://support.plex.tv/articles/202934883-cinema-trailers-extras/
*Plex, the Plex Play logo and Plex Media Server are trademarks of Plex and used under a license.