Web Developer Tools

Name: Web Developer Tools
Author: SessionManager.net

By: SessionManager.net Add-on

500+ Web development tools to inspect, debug, edit, test, optimize and audit websites. Privacy-first developer utility.

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-09-24

Version:

1.3.2

Last updated: 2026-09-22

Features & Capabilities

Web Developer Tools is a modern, privacy-first toolbox for web developers, frontend engineers, designers, QA testers, accessibility specialists and SEO professionals. Inspect, debug, edit, test, optimize and audit any website without leaving Firefox.

550+ developer tools, organized into clear categories:

🔍 HTML & DOM inspection and debugging
🎨 CSS inspection, visualization and live editing
⚙ JavaScript debugging, console capture and page analysis
🌐 Network, request header and resource inspection
💾 Storage, Cookies, Cache & IndexedDB managers
📈 SEO auditing and metadata analysis
♿ Accessibility (WCAG) inspection
⚡ Performance and Core Web Vitals analysis
🔒 Security header and HTTPS inspection
🖼 Image, Form and Responsive Design utilities
📱 PWA inspection and manifest validation
🧩 Technology detection
🎯 Color, typography and design tools
📄 Data formatting, generators and validators
🖥 Browser environment and page utilities

🔒 Privacy first

Every tool runs entirely on-device: the page data the tools read — DOM, CSS, cookies, headers, storage — is shown to you in your own browser and is never uploaded to us. We do not collect browsing history, keystrokes, analytics or telemetry of any kind. The extension contacts our servers only for the two things you choose to use: optional account sign-in (used solely to manage a Pro subscription) and the built-in feedback form, which sends only the message you write and the email address you optionally provide.

✨ Why you'll love it

550+ organized developer tools in one extension
Privacy-first — no unnecessary data collection
Fast, lightweight and easy to use
Works on virtually any website
Available in 11 languages
Powerful free features with optional Pro upgrades

Whether you're debugging layouts, inspecting HTML and CSS, auditing SEO, testing accessibility, analyzing performance or managing browser storage, Web Developer Tools provides everything you need in one place.

User Growth & Download Statistics

Add-on

By:

SessionManager.net

Daily users:

Version:

1.3.2 Last updated: 2026-09-22

Version code:

6498148

Creation date:

2026-09-19

Firefox add-on GUID:

web-developer-tools@webdevelopertools.dev

Firefox add-on numeric ID:

3075256

Firefox on Android:

Yes

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

1.20MB

Email:

we*****@gmail.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-24

Compare stats and ranking:

Ranking

# 26,307 ▲

Other rankings

#14 in developer tools keyword 60 ▲

#24 in developer keyword 60 ▲

#63 in development keyword 13 ▲

#134 in level keyword 34 ▲

#138 in tools keyword 61 ▲

Upgrade to see more rankings

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

SessionManager.net

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/web-developer-tools-dev/

Email:

we*****@gmail.com

Website:

https://webdevelopertools.dev/contact

Is Web Developer Tools Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Web Developer Tools requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Web Developer Tools is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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