Examine source code of YouTube Focus Mode ++

{
  "name": "YouTube Focus Mode",
  "version": "1.2",
  "description": "Extension to remove suggestions, comments, and distractions from YouTube™. Stay on track and avoid falling into an endless browsing loop",
  "permissions": [
    "*://www.youtube.com/*",
    "declarativeContent",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Rabbit Hole for YouTube™",
    "default_icon": {
      "16": "images/youtuberabbit16.png",
      "32": "images/youtuberabbit32.png",
      "48": "images/youtuberabbit48.png",
      "128": "images/youtuberabbit128.png"
    }
  },
  "icons": {
    "16": "images/youtuberabbit16.png",
    "32": "images/youtuberabbit32.png",
    "48": "images/youtuberabbit48.png",
    "128": "images/youtuberabbit128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "js/nav.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "images/rabbithole.png",
    "images/magicbunny.png"
  ],
  "incognito": "not_allowed",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{fea80b2a-37ce-4f70-bae8-501dc4d22bed}"
    }
  }
}