Examine source code of YouTube Speed Controller

{
  "manifest_version": 2,
  "name": "YouTube Speed Controller",
  "version": "1.3",
  "description": "Allows YouTube playback at any speed.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "browser_style": true,
    "show_matches": [
      "*://*.youtube.com/*"
    ],
    "default_popup": "controller.html",
    "default_icon": {
      "19": "icons/page-action/10-19.png",
      "38": "icons/page-action/10-38.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1ab2bf16-a321-4512-8690-924989617ac4}"
    }
  }
}