Examine source code of Spotlit

{
  "manifest_version": 3,
  "name": "Spotlit",
  "version": "1.0.0",
  "description": "Highlight any element or drag to select - creates spotlight screenshots with dimmed or blurred backgrounds",
  "homepage_url": "https://github.com/olestole/spotlit",
  "browser_specific_settings": {
    "gecko": {
      "id": "spotlit@olestole.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    }
  },
  "commands": {
    "activate-selection": {
      "suggested_key": {
        "default": "Alt+Shift+F",
        "mac": "Alt+Shift+F"
      },
      "description": "Activate element selection mode"
    }
  },
  "background": {
    "service_worker": "background/service-worker.js",
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}