# CO2estimeter

> Web extension for estimating the CO2 emissions of internet browsing

Canonical page: [https://chrome-stats.com/d/co2estimeter](https://chrome-stats.com/d/co2estimeter)

## Overview

- **ID:** `co2estimeter`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Alex
- **Category:** other
- **Daily users:** 4
- **Version:** 1.0.6
- **Last updated:** 2025-05-03
- **First published:** 2024-10-21
- **Size:** 1.60 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/co2estimeter/)

## Description

Get an estimate of the CO2 emissions of your web browsing activity based on the the Sustainabale Webdesign Model v4 (<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/533293a6c39044694eb45e808ba9a333c8cc41801176fb71986313ec8e023666/https%3A//sustainablewebdesign.org/estimating-digital-emissions/" rel="nofollow">https://sustainablewebdesign.org/estimating-digital-emissions/</a>). The model uses the number of bytes that are transferred when loading a web page, to estimate the associated cabon footprint.

CO2estimeter monitors the transfer sizes of web pages, via the browser's Performance API, and computes carbon emissions from that with the formulas of the Sustainable Webdesign Model v4. You can find more information on the extension's GitHub page (<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/6044bbc008a687b9b81025d028e6d51afb9f045b20e2696387f24b08c42d6328/https%3A//github.com/alexzurbonsen/co2estimeter" rel="nofollow">https://github.com/alexzurbonsen/co2estimeter</a>).

If you encounter bugs, please also visit the GitHub page and file an issue. Much appreciated.

## Rankings

- #46,340 — Overall
- #52 — sustainable
- #193 — appreciate

## Permissions and access

### Permissions

- `tabs`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/co2estimeter)