# Instant Performance Checker

> Check your website’s performance instantly without leaving your tab.

Canonical page: [https://chrome-stats.com/d/instant-performance-checker](https://chrome-stats.com/d/instant-performance-checker)

## Overview

- **ID:** `instant-performance-checker`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Tamsin Dillon
- **Category:** web-development
- **Version:** 0.1.0.1resigned1
- **Last updated:** 2025-12-04
- **First published:** 2025-12-01
- **Size:** 94 KB
- **Data as of:** 2026-09-15
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/instant-performance-checker/)

## Description

This tool allows you to run instant page audits directly from your browser. It measures loading time, interactivity, and content stability while suggesting ways to improve. No complex setup required — perfect for quick optimization checks.

## Rankings

- #131,747 — Overall

## Permissions and access

### Permissions

- `tabs`
- `http://*/*`
- `https://*/*`

## 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).

## Similar extensions and apps

- [Web Performance Analyzer](https://chrome-stats.com/d/web-performance-analyzer) — 3 users
- [Speed Score Viewer](https://chrome-stats.com/d/speed-score-viewer)
- [Website Performance Monitor](https://chrome-stats.com/d/website-performance-monitor) — 1 users
- [Quick Performance Viewer](https://chrome-stats.com/d/quick-performance-viewer)
- [Developer Site Tester](https://chrome-stats.com/d/developer-site-tester) — 1 users
- [Website Speed Tester](https://chrome-stats.com/d/website-speed-tester) — 6 users
- [Page Performance Checker](https://chrome-stats.com/d/page-performance-checker) — 5 users
- [Page Performance Insights](https://chrome-stats.com/d/page-performance-insights) — 1 users
- [Page Speed Tester](https://chrome-stats.com/d/page-speed-testerrrr)
- [Website Performance Analyzer Tool](https://chrome-stats.com/d/performance-analyzer-tool) — 5 users
- [Performance Analyzer](https://chrome-stats.com/d/performance-analyzer) — 1 users
- [Pingdom Performance Monitor](https://chrome-stats.com/d/pingdom-performance-monitor) — 1 users

---

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