Examine source code of BetterRBTV

{
  "manifest_version": 2,
  "name": "BetterRBTV",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "version": "18.8resigned1",
  "icons": {
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "exclude_matches": [
        "*://*.youtube.com/subscribe_embed*",
        "*://*.youtube.com/embed*",
        "*://*.youtube.com/yt/*"
      ],
      "js": [
        "lib/jquery-3.2.1.min.js",
        "lib/push.js",
        "constants.js",
        "util.js",
        "YouTubeLive.js",
        "default_settings.js",
        "colored_names.js",
        "better_mention_highlight.js",
        "better_separate_messages.js",
        "pinnable_mentions.js",
        "push_notifications.js",
        "sound_notifications.js",
        "chat_filter.js",
        "user_filters.js",
        "keyword_replacement.js",
        "beansplan.js",
        "entry.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "sounds/*",
    "img/*",
    "css/*"
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ce6b8a4-f74f-47af-b9f6-d16a9935457d}"
    }
  }
}