Examine source code of Youtube Video Looper

{
  "manifest_version": 3,
  "name": "Youtube Video Looper",
  "description": "Loop a video on the Youtube Website",
  "version": "1.0.1",
  "permissions": [
    "webNavigation"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "redstonerayy@github.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "style/content.css"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "resources/looper.html"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    },
    {
      "resources": [
        "images/noloop.svg"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    },
    {
      "resources": [
        "images/yesloop.svg"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/default_popup.html",
    "default_icon": "images/looper.png"
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png"
  }
}