Examine source code of Spotlight Focus

{
  "manifest_version": 3,
  "name": "Spotlight Focus",
  "version": "1.2.0",
  "description": "Focus on a specific part of the page without getting distracted. Good for people with ADHD.",
  "icons": {
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "overlay.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_title": "Spotlight Focus",
    "default_popup": "popup.html"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self' https: http: blob:; frame-src https: http: blob:; img-src 'self' data: https: http: blob:"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "spotlight-focus@mapaor",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}