Examine source code of Custom Cursors

{
  "manifest_version": 2,
  "name": "Custom Cursors",
  "version": "1.0",
  "description": "Change the mouse cursor style across all websites.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Custom Cursors"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d711967-f0c5-4e5a-9f06-3213b60656f3}"
    }
  }
}