Examine source code of Simple PCO Extension

{
  "manifest_version": 2,
  "name": "PCO Extension",
  "version": "1.9",
  "description": "This extension adds extra functionalities to Planning center online services. A \"Copy Lyrics\" button to songs within songs, and a \"Copy as playlist\" button within the media player of a plan",
  "icons": {
    "512": "icons/copy.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://services.planningcenteronline.com/songs/*/arrangements/*"
      ],
      "js": [
        "song.js"
      ]
    },
    {
      "matches": [
        "*://services.planningcenteronline.com/plans/*"
      ],
      "js": [
        "global.js",
        "plan.js"
      ]
    },
    {
      "matches": [
        "*://services.planningcenteronline.com/songs?*"
      ],
      "js": [
        "global.js",
        "songs.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://services.planningcenteronline.com/songs/*/arrangements/*",
    "*://api.planningcenteronline.com/services/v2/songs/*",
    "*://services.planningcenteronline.com/plans/*",
    "*://services.planningcenteronline.com/songs?*",
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{13387d2c-5aff-4304-88f9-4b6712a8511b}"
    }
  }
}