Schema Preview

Name: Schema Preview
Author: Damian

By: Damian

See, validate & score schema.org structured data (JSON-LD, Microdata & RDFa) on any page. Spot SEO gaps, errors, and Google rich-result eligibility, with a live search-result preview. Read-only and 100% private.

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Install

Features & Capabilities

Schema Preview reveals the structured data behind any web page, checks it against best-practice rules, and shows exactly what's missing for rich results — no copying markup into an online tester.

What it does

Detects JSON-LD, Microdata, and RDFa automatically, with a live count on the toolbar badge
Parses arrays and @graph, and resolves @id references between nodes
Completeness score (0–100) per schema, with required/recommended/optional coverage
Validation errors and warnings naming the exact missing fields
Google rich-result eligibility checks tied to Google's field requirements
Search-result (SERP) preview with stars and price
OpenGraph / Twitter Card / meta-tag overview
Reports JSON-LD syntax errors instead of failing silently
Deep links to schema.org and Google Search docs
Validates 47 common schema.org types; unknown types still shown
Filter, expand/collapse all, JSON viewer, copy and download
Dark and light themes; accessible, keyboard-navigable UI

Privacy first Schema Preview is strictly read-only. It only reads markup already on the page, never modifies it, makes no network requests, and sends no data anywhere. No analytics, no tracking, no account.

Cross-browser Built on Manifest V3 for Firefox, Chrome, and Chromium browsers.

User Growth & Download Statistics

Add-on

By:

Damian

Daily users:

Version:

1.0.0 Last updated: 2026-06-21

Version code:

6313558

Creation date:

2026-06-18

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

107.46KB

Email:

co*****@ddcode.cloud

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-06

Compare stats and ranking:

Ranking

# 109,504 ▼ 4,573

Other rankings

#123 in preview keyword 16 ▼ 2

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:

Damian

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/schema-preview/

Email:

co*****@ddcode.cloud

Website:

https://ddcode.cloud

Is Schema Preview 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 Preview requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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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.

Schema Preview 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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