Examine source code of YouTube Simple View

{
  "manifest_version": 2,
  "name": "YouTube Simple View: Hide distractions & more",
  "description": "Focus tool for YouTube: control distracting elements settings to stay focused.",
  "version": "0.9.6",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "webNavigation",
    "storage",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "YouTube Simple View",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3110b2a7-322c-44aa-9fc5-1733e061361c}"
    }
  }
}