Source vs Render SEO

Name: Source vs Render SEO
Author: Julian Cordes

By: Julian Cordes Add-on

Compares raw HTML vs. rendered DOM for SEO fields and shows indexability/rendering changes in the icon.

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-07-31

Version:

1.2.1

Last updated: 2026-06-16

Features & Capabilities

Compares raw HTML vs. rendered DOM for SEO fields and shows indexability/rendering changes in the icon.

Source vs Render SEO compares the raw HTML source of a page with the rendered DOM and shows whether JavaScript changed important SEO fields such as canonical, meta robots, title, meta description, H1s, or hreflangs.

What It Does

Many SEO issues only become visible after JavaScript has run. This extension checks both versions of a page:

Source HTML: the raw HTML returned by the server before JavaScript execution
Rendered DOM: the final document after JavaScript has modified the page

The extension then highlights differences directly in the popup and updates the toolbar icon to show the current indexability and rendering state. The toolbar icon show green, red, yellow or a combination, depending on the changes.

Toolbar colors 🟩 indexable 🟥 not indexable 🟩🟨 indexable, but JavaScript changes content 🟥🟨 not indexable, but JavaScript changes content 🟩🟥 indexable, but JavaScript changes to not indexable 🟥🟩 not indexable, but JavaScript changes to indexable

Key Features

Compare raw HTML vs rendered DOM
Detect JavaScript changes to SEO-critical fields
Check indexability via meta robots and canonical
Show a state-aware toolbar icon for each page
Switch between Compare, HTML-only, and Rendered-only modes
Display inline source-vs-rendered differences next to each field
Works on regular websites and local test files when file URL access is enabled
Plain JavaScript, no build step, no bundler

User Growth & Download Statistics

Add-on

By:

Julian Cordes

Daily users:

Version:

1.2.1 Last updated: 2026-06-16

Version code:

6309414

Creation date:

2026-05-27

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

97.40KB

Email:

ha*****@juliancordes.de

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-31

Compare stats and ranking:

Ranking

# 128,670 ▲ 1,260

Other rankings

#104 in source code keyword 10 ▼ 3#118 in seo keyword 63 ▼ 3#119 in source keyword 18 ▼ 4#159 in resource keyword 25 ▼ 3#208 in trend keyword 33 ▲ 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:

Julian Cordes

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/source-vs-render-seo/

Email:

ha*****@juliancordes.de

Is Source vs Render SEO 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.

Source vs Render SEO 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.

Source vs Render SEO 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 has low user count. Unpopular extensions may not be stable or safe.
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