Examine source code of YouTube Spacebar Pause

{
  "description": "Pauses YouTube Videos with Spacebar, Focussed or not",
  "manifest_version": 2,
  "name": "YouTube Spacebar Pause",
  "version": "1.1resigned1",
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "http://www.youtube.com/*",
        "https://www.youtube.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c565c3a-8e30-4710-b4d3-30a84b38259c}"
    }
  }
}