Examine source code of YouTube CleanSlate

{
  "manifest_version": 2,
  "name": "YouTube CleanSlate",
  "version": "1.5",
  "description": "Removes various UI elements from YouTube for a cleaner experience.",
  "icons": {
    "48": "icon-disabled.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon-disabled.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a5188bf-3f1c-44ce-89cb-e28b4bccc785}"
    }
  }
}