Examine source code of YouTube LevelUp

{
  "manifest_version": 2,
  "name": "YouTube LevelUp",
  "version": "1.4.0",
  "description": "Blocks Shorts & members-only, returns dislikes, skips sponsors, anti-translate, auto-continues, background playback",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "https://returnyoutubedislikeapi.com/*",
    "https://sponsor.ajay.app/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*",
        "*://*.youtubekids.com/*"
      ],
      "js": [
        "main-world.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*",
        "*://*.youtubekids.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-levelup@tn3w",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_data": false
      }
    }
  }
}