Examine source code of YouTube Speed Enhancer

{
  "manifest_version": 2,
  "name": "YouTube Speed Enhancer",
  "version": "1.0",
  "description": "Set custom playback speeds on YouTube videos beyond the default limit.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a045ed13-8ec7-4136-b46e-527c859c53bc}"
    }
  }
}