Examine source code of Page Spotlight

{
  "manifest_version": 3,
  "version": "1.0.0",
  "name": "Page Spotlight",
  "author": "Dziad Borowy",
  "description": "Highlight a block of content/text on any website to help you focus on it",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "worker.js"
    ]
  },
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "96": "assets/icon96.png"
  },
  "action": {
    "default_title": "Add spotlight to this website"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "page-spotlight@perfectthings.dev",
      "strict_min_version": "109.0"
    }
  }
}