Examine source code of PlayerTube

{
  "manifest_version": 2,
  "name": "PlayerTube",
  "description": "The secret ingredient for a older (and better) looking YouTube.",
  "version": "1.12.2",
  "homepage_url": "https://github.com/ktg5/PlayerTube",
  "background": {
    "scripts": [
      "src/pt-background.js"
    ],
    "persistent": false,
    "type": "module"
  },
  "icons": {
    "16": "img/playertube/resize/16.png",
    "32": "img/playertube/resize/32.png",
    "48": "img/playertube/resize/48.png",
    "128": "img/playertube/resize/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/pt-setup.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/pt-main.js"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/embed/*",
        "*://*.youtube-nocookie.com/embed/*"
      ],
      "js": [
        "src/pt-setup.js",
        "src/pt-delhiembed.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "css/*",
    "src/*",
    "img/*",
    "default-config.json",
    "manifest.json"
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{925b0516-774d-469d-bb0e-2b94f199b29a}"
    }
  },
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": "img/playertube/icon.png"
  }
}