Examine source code of Spotify-Playlist-Builder

{
  "name": "Spotify-Playlist-Builder",
  "version": "0.2.8",
  "manifest_version": 2,
  "description": "Create Spotify playlists from Spinitron, Bandcamp Daily and Chirp Radio, Pitchfork,  more coming soon!.",
  "homepage_url": "https://github.com/aeikenberry/spinitron-chrome-ext",
  "default_locale": "en",
  "permissions": [
    "cookies",
    "https://spinitron.com/*",
    "https://chirpradio.org/charts*",
    "https://daily.bandcamp.com/*",
    "https://pitchfork.com/features/lists-and-guides/*",
    "https://api.spotify.com/v1/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://chirpradio.org/charts*"
      ],
      "css": [
        "src/inject/inject.css"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/jquery/jquery.cookie.js",
        "js/spotify/spotify-web-api.js",
        "src/inject/sessions.js",
        "src/inject/chirp.js"
      ]
    },
    {
      "matches": [
        "https://www.spinitron.com/*",
        "https://spinitron.com/*",
        "https://daily.bandcamp.com/*",
        "https://pitchfork.com/features/lists-and-guides/*"
      ],
      "css": [
        "src/inject/inject.css"
      ]
    },
    {
      "matches": [
        "https://www.spinitron.com/*",
        "https://spinitron.com/*"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/jquery/jquery.cookie.js",
        "js/spotify/spotify-web-api.js",
        "src/inject/common.js",
        "src/inject/spinitron.js"
      ]
    },
    {
      "matches": [
        "https://daily.bandcamp.com/*"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/jquery/jquery.cookie.js",
        "js/spotify/spotify-web-api.js",
        "src/inject/common.js",
        "src/inject/bandcamp.js"
      ]
    },
    {
      "matches": [
        "https://pitchfork.com/features/lists-and-guides/*"
      ],
      "css": [
        "src/inject/pitchfork.css"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/jquery/jquery.cookie.js",
        "js/spotify/spotify-web-api.js",
        "src/inject/common.js",
        "src/inject/pitchforkLists.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "spotify_playlist_builder@0.2.5"
    }
  }
}