Examine source code of Excalidraw Super Zen

{
  "manifest_version": 3,
  "name": "Excalidraw Super Zen",
  "version": "10000.0.0.3",
  "description": "Hide all UI for a clean, focused experience. MacOS: Cmd + Shift + B Windows: Ctrl + Shift + B",
  "content_scripts": [
    {
      "matches": [
        "https://app.excalidraw.com/s/*",
        "https://excalidraw.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "excalidraw-super-zen@swarnim.me"
    }
  },
  "permissions": [
    "storage"
  ]
}