Examine source code of YouTube Screenshot Button

{
  "manifest_version": 2,
  "name": "YouTube Screenshot",
  "description": "Take screenshots from YouTube Video & Shorts",
  "version": "4.4.2",
  "icons": {
    "96": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "YouTube Screenshot",
    "default_popup": "options/index.html#popup",
    "browser_style": true
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8b32864-153d-47fb-93ea-c273c4d1ef17}"
    }
  }
}