Youtube Video Thumbnail Downloader

Copy a video url from youtube and then get video thumbnail in 5 different sizes.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Youtube Video Thumbnail Downloader",
  "version": "1.0.0",
  "description": "Copy a video url from youtube and then get video thumbnail in 5 different sizes.",
  "browser_action": {
    "default_icon": "icon/youthumb.png",
    "default_popup": "index.html"
  }
}