manifest.json

{
  "manifest_version": 2,

  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "0.300",

  "permissions": [
    "tabs", "webRequest", "notifications", "webRequestBlocking", "clipboardWrite",
    "http://www.youtube.com/*", "https://www.youtube.com/*", 
    "http://www.billboard.com/rss/charts/*", "http://www1.billboard.com/rss/charts/*",
    "https://www.youtube.com/embed/*", "https://www.googleapis.com/youtube/v3/*",
    "http://apis.skplanetx.com/melon/*"
  ],

  "browser_action": {
    "default_icon": "static/img/icon48.png",
    "default_popup": "templates/popup.html"
  },

  "icons": {
    "48": "static/img/icon48.png",
    "128": "static/img/icon128.png"
  },

  "commands": {
    "togglePlay": {
      "suggested_key": {
        "default": "Ctrl+Shift+X",
        "mac": "Command+Shift+X"
      },
      "description": "Toggle play/pause"
    },
    "playNextSong": {
      "suggested_key": {
        "default": "Ctrl+Shift+Period",
        "mac": "Command+Shift+Period"
      },
      "description": "Play next song"
    },
    "playPrevSong": {
      "suggested_key": {
        "default": "Ctrl+Shift+Comma",
        "mac": "Command+Shift+Comma"
      },
      "description": "Play previous song"
    },
    "toggleLoopActive": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description": "Turn on/off looping the current song"
    }
  },

  "background": {
    "page": "templates/background.html"
  },

  "content_security_policy": "script-src 'self' 'unsafe-eval' https://s.ytimg.com/yts/jsbin/ https://www.youtube.com/ https://ssl.google-analytics.com/ http://localhost; object-src 'self'"
}