Examine source code of PlayOnTidal

{
  "manifest_version": 2,
  "name": "PlayOnTidal",
  "version": "0.2.1",
  "description": "Changes music play buttons to launch TIDAL Desktop. Adds a menu option to play link or selection on TIDAL",
  "browser_specific_settings": {
    "gecko": {
      "id": "playontidal@example.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.last.fm/*"
      ],
      "js": [
        "lastfm.js"
      ]
    },
    {
      "matches": [
        "*://listen.tidal.com/search/*"
      ],
      "js": [
        "TIDAL.js"
      ]
    },
    {
      "matches": [
        "*://rutracker.org/forum/tracker.php?nm=*"
      ],
      "js": [
        "rutracker.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}