Examine source code of AutoPinPlay

{
  "manifest_version": 2,
  "name": "AutoPinPlay",
  "version": "1.0",
  "description": "Auto pins tabs with playing media",
  "permissions": [
    "tabs",
    "storage"
  ],
  "icons": {
    "48": "icons/border-48.png"
  },
  "background": {
    "scripts": [
      "autoPinPlay.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@autoPinPlay",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}