JavaScript Playground ⚡ Online JS Compiler by onyxwizard
**Write and run JavaScript code instantly.** Skip the setup and open a distraction-free playground with a single click. Test functions, debug concepts, or learn new features right in a dedicated popup. just pure, instant JS code execution.
Available on Firefox for Android™Available on Firefox for Android™
Extension Metadata
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About this extension
A lightweight, cyber‑themed JavaScript playground that lives in your browser. Click the toolbar icon → a new tab opens with a side‑by‑side editor and output panel.
✅ Features:
• Real‑time evaluation – auto‑runs as you type (toggle on/off)
• Manual run via button or Ctrl+Enter
• Full JavaScript syntax highlighting (CodeMirror with Darcula theme)
• Console.log capture – shows output in the right panel
• Error display with clear visual feedback
• Persistent storage – your code is saved automatically
• Clean, responsive dark cyber design
No tracking, no data collection, no external servers – everything runs locally in your browser.
✅ Features:
• Real‑time evaluation – auto‑runs as you type (toggle on/off)
• Manual run via button or Ctrl+Enter
• Full JavaScript syntax highlighting (CodeMirror with Darcula theme)
• Console.log capture – shows output in the right panel
• Error display with clear visual feedback
• Persistent storage – your code is saved automatically
• Clean, responsive dark cyber design
No tracking, no data collection, no external servers – everything runs locally in your browser.
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Permissions and data
Required permissions:
- Access browser tabs
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.1
- Size
- 95.05 kB
- Last updated
- 8 days ago (13 Feb 2026)
- Related Categories
- Licence
- MIT Licence
- Version History
- Tags
- Add to collection