Youtube like to view ratio

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Youtube like to view ratio",
  "description": "Displays the percentage of likes to views, more popular videos have a higher ratio.",
  "version": "0.0.1.0",
  "manifest_version": 2,
  "icons": {
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "homepage_url": "https://github.com/amnrst/youtube-like-to-view-ratio",
  "permissions": [
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ]
}