Examine source code of YouTube Hover Actions

{
  "manifest_version": 3,
  "name": "YouTube Hover Actions",
  "version": "1.1.2",
  "description": "Adds Not interested and Don't recommend channel actions directly on YouTube video cards.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "js": [
        "content.global.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "js": [
        "content-isolated.global.js"
      ],
      "run_at": "document_start",
      "world": "ISOLATED"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-hover-actions@picky",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}