Examine source code of Smear Cursor

{
  "manifest_version": 3,
  "name": "Smear Cursor",
  "version": "1.0.0",
  "description": "Animate the cursor with a smooth smear trail effect in text fields. Inspired by smear-cursor.nvim for Neovim.",
  "browser_specific_settings": {
    "gecko": {
      "id": "smear-cursor@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "Smear Cursor",
    "default_icon": {
      "16": "icons/icon.svg",
      "48": "icons/icon.svg",
      "128": "icons/icon.svg"
    }
  },
  "icons": {
    "16": "icons/icon.svg",
    "48": "icons/icon.svg",
    "128": "icons/icon.svg"
  }
}