# core-js count

> how many copies of core-js are on this page?

Canonical page: [https://chrome-stats.com/d/core-js-count](https://chrome-stats.com/d/core-js-count)

## Overview

- **ID:** `core-js-count`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** easrng
- **Category:** web-development
- **Daily users:** 1
- **Version:** 1.1
- **Last updated:** 2026-04-17
- **First published:** 2026-04-12
- **Size:** 13 KB
- **Data as of:** 2026-09-16
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/core-js-count/)

## Description

Many websites use <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/16aae64bf391cdc949c47fb93a36f0b1f1b84b649c98eb91b3412da964cadbd4/https%3A//core-js.io/" rel="nofollow">core-js</a>, sometimes even multiple copies! This extension shows a badge counting how many copies have loaded on a page.

## Rankings

- #96,207 — Overall

## Permissions and access

### Permissions

- `tabs`
- `<all_urls>`
- `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/core-js-count)