Examine source code of 'Improve YouTube!' 🎧 (For YouTube & Video)

{
  "manifest_version": 3,
  "short_name": "ImprovedTube",
  "name": "'Improve YouTube!' 🎧 (for YouTube & Videos)",
  "description": "__MSG_description_ext__",
  "version": "4.2028",
  "default_locale": "en",
  "icons": {
    "16": "menu/icons/16.png",
    "32": "menu/icons/32.png",
    "48": "menu/icons/48.png",
    "128": "menu/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c6bf0cc-3ae2-42fb-9993-0d33104fdcaf}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "background.scripts": "background.js"
  },
  "action": {
    "default_popup": "menu/index.html",
    "default_area": "navbar"
  },
  "options_page": "menu/index.html",
  "options_ui": {
    "page": "menu/index.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "css": [
        "js&css/extension/www.youtube.com/styles.css",
        "js&css/extension/www.youtube.com/night-mode/night-mode.css",
        "js&css/extension/www.youtube.com/general/general.css",
        "js&css/extension/www.youtube.com/appearance/header/header.css",
        "js&css/extension/www.youtube.com/appearance/player/player.css",
        "js&css/extension/www.youtube.com/appearance/details/details.css",
        "js&css/extension/www.youtube.com/appearance/sidebar/sidebar.css",
        "js&css/extension/www.youtube.com/appearance/comments/comments.css"
      ],
      "exclude_matches": [
        "https://www.youtube.com/audiolibrary/*",
        "https://www.youtube.com/tv*"
      ],
      "js": [
        "js&css/extension/core.js",
        "js&css/extension/functions.js",
        "js&css/extension/www.youtube.com/night-mode/night-mode.js",
        "js&css/extension/www.youtube.com/general/general.js",
        "js&css/extension/www.youtube.com/appearance/sidebar/sidebar.js",
        "js&css/extension/www.youtube.com/appearance/comments/comments.js",
        "js&css/extension/init.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "optional_host_permissions": [
    "https://returnyoutubedislikeapi.com/*"
  ],
  "optional_permissions": [
    "downloads"
  ],
  "permissions": [
    "contextMenus",
    "storage",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "menu/index.html",
        "js&css/web-accessible/core.js",
        "js&css/web-accessible/functions.js",
        "js&css/web-accessible/www.youtube.com/appearance.js",
        "js&css/web-accessible/www.youtube.com/player.js",
        "js&css/web-accessible/www.youtube.com/themes.js",
        "js&css/web-accessible/www.youtube.com/playlist.js",
        "js&css/web-accessible/www.youtube.com/playlist-complete-playlist.js",
        "js&css/web-accessible/www.youtube.com/playlist-cleaner.js",
        "js&css/web-accessible/www.youtube.com/channel.js",
        "js&css/web-accessible/www.youtube.com/shortcuts.js",
        "js&css/web-accessible/www.youtube.com/blocklist.js",
        "js&css/web-accessible/www.youtube.com/settings.js",
        "js&css/web-accessible/www.youtube.com/last-watched-overlay.js",
        "js&css/web-accessible/www.youtube.com/return-youtube-dislike.js",
        "js&css/web-accessible/www.youtube.com/return-youtube-dislike.css",
        "js&css/web-accessible/init.js",
        "menu/icons/48.png"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    }
  ]
}