Examine source code of Youtube Colors

{
  "description": "Selects a random color for YouTube",
  "manifest_version": 2,
  "name": "YouTube Colors",
  "version": "1.3resigned1",
  "icons": {
    "48": "icons/color.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "js": [
        "colorTube.js"
      ],
      "css": [
        "color.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02a6316b-0a06-42f4-a395-a6e0c293ac46}"
    }
  }
}