Examine source code of YouTube Intro Skipper

{
  "name": "YouTube Skipper",
  "description": "A Firefox extension for starting YouTube videos at predefined start time",
  "version": "0.1.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "webNavigation",
    "tabs",
    "https://www.youtube.com/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/logo16.png",
      "32": "/images/logo32.png",
      "48": "/images/logo48.png",
      "128": "/images/logo128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "/images/logo16.png",
    "32": "/images/logo32.png",
    "48": "/images/logo48.png",
    "128": "/images/logo128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube_skipper_hcwtam@gmail.com"
    }
  }
}