Examine source code of Focus Guard

{
  "manifest_version": 3,
  "name": "Focus Guard",
  "version": "1.0.0",
  "description": "Set time limits on distracting sites and get reminded to take a break.",
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content/overlay.css"
      ],
      "js": [
        "content/overlay.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "focusguard9@gmail.com",
      "data_collection_permissions": {
        "collects_user_data": false,
        "required": [
          "none"
        ]
      }
    }
  }
}