GreenCheck

Name: GreenCheck
Author: GreenCheck

GreenCheck is a browser extension that identifies websites running on green energy and does analysis on the site’s carbon emissions.

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Install

Features & Capabilities

🌱 Key Features

Instantly spot which websites are powered by green energy with a leaf icon (🌱). See details about the hosting provider and access a dropdown with public documentation on their green energy claims.

Uses The Green Web Foundation’s verified dataset, ensuring reliable information on providers that actively reduce, avoid, or offset emissions from electricity use.

Already on a website? Open the extension’s popup to check if it’s running on green energy. View the hosting provider, energy status, and supporting information—all in one place.

Run a Carbon Analysis to calculate the emissions from reloading a page. Get an easy-to-read rating (A+ to F) comparing its carbon footprint against others.

🌱 About Us

GreenCheck was founded in Scotland in June 2024 to make the invisible energy impact of the web easier to understand. Our mission: help people make more informed choices about the websites they visit and the energy sources powering them.

We also care deeply about your privacy—your browsing history and personal data remain completely private.

🌱 Changelog

July 2024 – v0.1.0: Beta release for early feedback.

January 2025 – v0.2.0: New checkbox logo + dependency updates.

September 2025 – v0.3.0: Faster performance + removed license key requirement.

User Growth & Download Statistics

Add-on

By:

GreenCheck

Daily users:

Version:

0.3.0 Last updated: 2025-09-24

Version code:

6040909

Creation date:

2024-07-08

Risk:

Permissions:

Host permissions:

https://*/*

Content scripts matches:

<all_urls>
www.google.com

Size:

444.36KB

Email:

gr*****@proton.me

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-16

Compare stats and ranking:

Ranking

# 61,092 ▼ 319

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:

GreenCheck

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/greencheck/

Email:

gr*****@proton.me

Website:

https://getgreencheck.com/

Permission Change History

2025-09-24: Version 0.2.0 → 0.3.0

Add Permissions: webRequest webRequestBlocking tabs <all_urls>

2024-07-29: Version 0.0.8 → 0.1.0

Add Permissions: storage activeTab

Is GreenCheck 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.

GreenCheck requires a lot of sensitive permissions. 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.

GreenCheck is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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