Examine source code of Filter for YouTube™ live-chats

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "0.1.28",
  "homepage_url": "https://github.com/MengeTM/Filter-For-YouTube-Live-Chats",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0",
      "id": "{4a735e17-e9aa-443c-8562-50f4bc5f5067}"
    }
  },
  "description": "__MSG_extensionDescription__",
  "icons": {
    "128": "youtube_stream_filter.svg"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true,
    "browser_style": true
  },
  "browser_action": {
    "default_popup": "dropdown_settings/dropdown_settings.html"
  },
  "background": {
    "scripts": [
      "background_page/background_script.js"
    ]
  },
  "web_accessible_resources": [
    "menu_item/menu.svg",
    "menu_item/enable_highlight.svg",
    "settings/filters/trash.svg",
    "dropdown_settings/dropdown_settings.html"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube.com/live_chat_replay*"
      ],
      "all_frames": true,
      "js": [
        "separator.js",
        "chatbox.js",
        "settings/switch/toggle_switch.js",
        "settings/filters/filter_list.js",
        "youtube_overlay.js",
        "menu_item/menu_item.js",
        "settings/select_box.js",
        "xml.js",
        "i18n.js",
        "storage.js",
        "filter_data.js",
        "dropdown_settings/dropdown_settings.js",
        "youtube_filter.js",
        "main.js"
      ],
      "css": [
        "style.css",
        "settings/switch/toggle_switch.css",
        "dropdown_settings/style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage",
    "*://www.youtube.com/*"
  ]
}