Examine source code of Player for video

{
  "manifest_version": 2,
  "name": "Nocturne Player",
  "version": "0.6.0",
  "description": "A touch-first video player for streaming sites and YouTube: thick seek bar, gesture controls, quality and subtitle picker, night light and colour tuning.",
  "author": "Vlad Pohorilets",
  "homepage_url": "https://github.com/kvachikk/nocturne-player",
  "browser_specific_settings": {
    "gecko": {
      "id": "nocturne-player@kvachikk.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_idle",
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Nocturne Player",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  }
}