Examine source code of QuickPlay Mini Player

{
  "manifest_version": 2,
  "name": "QuickPlay Mini Player",
  "version": "1.0",
  "description": "Open any video on the web in a floating mini player (picture-in-picture style).",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "QuickPlay Mini Player"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "quickplay-mini-player@amo.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}