# DEV-Tools

> Adds a new sidebar to the developer tools inspector panel. The sidebar displays the page document as an inspectable object.

Canonical page: [https://chrome-stats.com/d/dev-tools](https://chrome-stats.com/d/dev-tools)

## Overview

- **ID:** `dev-tools`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Juniper
- **Category:** web-development
- **Daily users:** 22
- **Weekly downloads:** 1
- **Rating:** 4.50 / 5 (2 ratings)
- **Version:** 8.9.0
- **Last updated:** 2022-08-16
- **First published:** 2022-08-15
- **Size:** 8.34 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/dev-tools/)

## Description

DEV-Tools is a Firefox add-on that adds a new sidebar to the developer tools inspector panel. This sidebar allows users to view and inspect the properties of the current selected node in the markup view. It achieves this by using `sidebar.setExpression($0)` each time a new node is selected. The functionality is provided through a listener added via `browser.devtools.panels.elements.onSelectionChanged`.

## Rankings

- #23,353 — Overall
- #78 — tools
- #170 — tool
- #196 — property

## Permissions and access

### Permissions

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low 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/dev-tools)