# Multi-Panel Source Viewer

> View HTML, CSS, and JavaScript side by side in tabs.

Canonical page: [https://chrome-stats.com/d/multi-panel-source-viewer](https://chrome-stats.com/d/multi-panel-source-viewer)

## Overview

- **ID:** `multi-panel-source-viewer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Kabir Gibbons
- **Category:** web-development
- **Version:** 1.4.3
- **Last updated:** 2025-10-30
- **First published:** 2025-10-27
- **Size:** 172 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/multi-panel-source-viewer/)

## Description

Compare different code types without switching views. The split-panel interface allows side-by-side inspection of HTML structure, CSS rules, and JS logic for a smoother debugging experience.

## Rankings

- #135,697 — Overall
- #221 — source code

## Permissions and access

### Permissions

- `<all_urls>`
- `clipboardWrite`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/multi-panel-source-viewer)