Examine source code of LeanBack

{
  "manifest_version": 2,
  "name": "LeanBack",
  "version": "1.0.2resigned1",
  "description": "Automatically switch YouTube Tabs, once a video has finished",
  "icons": {
    "48": "img/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4dd2f0f7-46f9-4c71-8840-a8118dbc0491}"
    }
  }
}