Examine source code of Flash McTube

{
  "manifest_version": 2,
  "name": "Flash McTube",
  "version": "1.0.0",
  "description": "Bypass YouTube artificial slowdowns for ad-blocker users. Works with uBlock Origin, AdBlock Plus, AdGuard, Ghostery, Privacy Badger. Instant video loading guaranteed.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.youtube.com/*",
    "*://*.googlevideo.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-speedup@flash-mctube.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}