Examine source code of Clear New Tab

{
  "manifest_version": 3,
  "version": "6.12.1",
  "default_locale": "en",
  "icons": {
    "16": "icon_colored16.png",
    "24": "icon_colored24.png",
    "32": "icon_colored32.png",
    "48": "icon_colored48.png",
    "64": "icon_colored64.png",
    "96": "icon_colored96.png",
    "128": "icon_colored128.png"
  },
  "action": {
    "default_icon": {
      "16": "icon_colored16.png",
      "24": "icon_colored24.png",
      "32": "icon_colored32.png",
      "48": "icon_colored48.png",
      "64": "icon_colored64.png",
      "96": "icon_colored96.png",
      "128": "icon_colored128.png"
    }
  },
  "name": "Clear New Tab",
  "description": "__MSG_description__",
  "web_accessible_resources": [
    {
      "resources": [
        "sandbox.html",
        "sandbox.mjs",
        "chunks/scripts.mjs",
        "chunks/client.mjs"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "type": "module",
    "scripts": [
      "background.mjs",
      "offscreen.mjs"
    ]
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "chrome_url_overrides": {
    "newtab": "new_tab.html"
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "optional_permissions": [
    "clipboardRead"
  ],
  "host_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "clear-new-tab@loftyshaky"
    },
    "strict_min_version": "153.0.0"
  }
}