Examine source code of Overlay Blocker

{
  "manifest_version": 3,
  "name": "Overlay Blocker",
  "version": "1.0.0",
  "description": "Creates a resizeable and moveable overlay that covers part of the current web page",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "overlay-blocker@aidenkmorris",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Overlay Blocker"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ]
}