Examine source code of FocusNuke

{
  "manifest_version": 3,
  "name": "FocusNuke",
  "version": "1.0",
  "description": "One click focus sessions",
  "web_accessible_resources": [
    {
      "resources": [
        "nuked.html",
        "shared.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess",
    "webNavigation",
    "contextMenus",
    "history"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "FocusNuke"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rajeshs142@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}