Highlight the name of a song, movie, book, etc. and right click for the option to find a downloadable file of it. By Ritchie Thai.
The extension suggested in this Reddit post:
http://www.reddit.com/r/YouShouldKnow/comments/2586l9/ysk_you_can_find_and_download_anything_song/
If you highlight the title of a song, movie, or book (or some other thing) then right click, you'll have the option to make a Google search to find downloads of that file using the method described in that Reddit post.