Examine source code of Youtube Continue

{
  "manifest_version": 2,
  "name": "Youtube Continue",
  "version": "1.2",
  "description": "Continues youtube videos",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "continue.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a490b19a-b211-4064-9346-b891c733bdea}"
    }
  }
}