Examine source code of YouTube Star Rating

{
  "manifest_version": 3,
  "version": "2.5.3",
  "name": "YouTube Star Rating",
  "description": "The ultimate rating system for YouTube.",
  "author": "Žan Ožbot",
  "homepage_url": "https://youtubestarrating.ozbot.si/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e50a9750-5ad8-48c9-b995-13267bede639}"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "16": "/icons/16x16.png",
    "32": "/icons/32x32.png",
    "48": "/icons/48x48.png",
    "128": "/icons/128x128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/icons/16x16.png",
      "32": "/icons/32x32.png",
      "48": "/icons/48x48.png",
      "128": "/icons/128x128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://youtube.com/*",
        "*://www.youtube.com/*",
        "*://m.youtube.com/*"
      ],
      "exclude_matches": [
        "*://*.music.youtube.com/*"
      ],
      "css": [
        "content-styles.css"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "*://*.youtube.com/*"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "template.html"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ]
}