Schema Markup Validator

Name: Schema Markup Validator
Author: georgeneveu

Validate Schema.org JSON-LD structured data offline or generate it for any page using GPT-4o or Claude. Deep scan any page, fix errors, boost rich results for your microdata.

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Features & Capabilities

A browser extension for Firefox that validates existing JSON-LD on any page and generates new Schema.org markup - ready to paste in the code of your page for rich search results.

🔍 Deep Scan Detects all existing JSON-LD blocks on the active page and validates them against Schema.org rules — spotting missing fields, wrong date formats, invalid enum values, and more.

🤖 AI Generation Scrapes the page (title, headings, price signals, OG meta, existing schemas) and sends context to your chosen AI model, which picks the right schema type and fills every field accurately.

🔀 OpenAI & Claude Use your own OpenAI (GPT-4o, GPT-4 Turbo, GPT-3.5) or Anthropic (Claude Sonnet, Opus, Haiku) key. Switch provider and model any time.

✅ External Validators One-click launch of Google's Rich Results Test and Schema.org Validator for final verification before deploying to your site.

🔒 Your API keys never leave your browser Keys are stored exclusively in the browser's sandboxed local storage — they never touch any third-party server. The only outbound requests go directly to api.openai.com or api.anthropic.com when you click Generate.

User Growth & Download Statistics

Add-on

By:

georgeneveu

Daily users:

3 1

Version:

1.0 Last updated: 2026-05-06

Version code:

6245237

Creation date:

2026-05-03

Risk:

Permissions:

storage
activeTab
https://api.openai.com/*
https://api.anthropic.com/*

Size:

516.15KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-04

Compare stats and ranking:

Ranking

# 52,193 ▲ 9,403

Other rankings

#111 in gpt-4o keyword 20 ▲ 26

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:

georgeneveu

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/schema-markup-validator/

Is Schema Markup Validator 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.

Schema Markup Validator requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

High Request access to the following domains: openai.com, anthropic.com

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.

Schema Markup Validator 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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