# ChatGPT Context Window Meter

> Shows an estimated ChatGPT conversation context window usage meter inside the page.

Canonical page: [https://chrome-stats.com/d/chatgpt-context-window-meter](https://chrome-stats.com/d/chatgpt-context-window-meter)

## Overview

- **ID:** `chatgpt-context-window-meter`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Expsy
- **Category:** tabs
- **Daily users:** 5
- **Weekly downloads:** 3
- **Version:** 0.1.0
- **Last updated:** 2026-04-18
- **First published:** 2026-04-15
- **Size:** 15 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/chatgpt-context-window-meter/)

## Description

ChatGPT Context Window Meter adds a small in-page meter to <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/68a188960f04e2a84c1f04ab562a849360a490d4e86c75e7c7be3ab59437f37d/http%3A//chatgpt.com" rel="nofollow">chatgpt.com</a> and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/20e01e30ea25078cea902794aa1e958707e366e9d854536f80d3480d0584470a/http%3A//chat.openai.com" rel="nofollow">chat.openai.com</a>.

It estimates how much of the current conversation context window is being used based on the visible conversation text and the current draft message. The add-on is intended to help decide when a thread is getting crowded and when it may be better to start a new chat.

Features:
- Estimated context usage percentage
- Linear meter in full view
- Minimized circular meter mode
- Adjustable assumed context window size
- Adjustable reply buffer
- Runs entirely in the page as a lightweight content script

Important note:
This add-on does not use any private OpenAI API or hidden token counter. The displayed value is an estimate based on visible page content and simple token heuristics, so it should be treated as guidance rather than an official token count.

## Rankings

- #46,291 — Overall
- #148 — context menu
- #227 — chatgpt

## Permissions and access

### Permissions

- `storage`

### Content script matches

- `chatgpt.com`
- `chat.openai.com`

## Safety

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

### Analysis details

- Request access to the following domains: chatgpt.com, openai.com
- 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/chatgpt-context-window-meter)