Examine source code of Auto-play

{
  "name": "Auto-play",
  "short_name": "Auto-play",
  "description": "An extension that allows you to auto play videos if you are watching movies on website that don't support it",
  "version": "0.0.1",
  "devtools_page": "devtools.html",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/mbcrump"
      ],
      "js": [
        "auto-play.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4852faf-5315-4c89-80f6-40e69c2b94d5}"
    }
  }
}