Youtube like-dislike ratio

It shows a whole number ratio of likes over dislikes of a youtube video

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Youtube like-dislike ratio",
  "description": "It shows a whole number ratio of likes over dislikes of a youtube video",
  "version": "2.0",
  "icons": {
    "64": "yt-like-dislike64.png"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "js": [
        "main.js"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ]
}