Examine source code of Youtube Opaquifier

{
  "manifest_version": 2,
  "name": "Youtube Opaquifier",
  "version": "1.0",
  "description": "Makes the parts of youtube's UI that are ever-so-slightly transparent not.",
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "yto.js"
      ]
    }
  ]
}