YouTube Thumbnail Grabber

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "YouTube Thumbnail Grabber",
  "version": "1.0",
  "description": "Get thumbnails of YouTube videos, made by FeriVOQ",
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "permissions": [
    "downloads"
  ],
  "action": {
    "default_popup": "files/popup.html",
    "matches": [
      "https://www.youtube.com/*"
    ],
    "default_title": "YouTube Thumbnail Grabber",
    "default_icon": {
      "16": "img/icon16.png",
      "32": "img/icon32.png",
      "48": "img/icon48.png",
      "128": "img/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "files/popup.js"
      ]
    }
  ]
}