# Site Load Analyzer

> Analyze page load time, transfer size, requests, and the heaviest images, videos, scripts, styles, and fonts directly in Firefox DevTools.

Canonical page: [https://chrome-stats.com/d/site-load-analyzer](https://chrome-stats.com/d/site-load-analyzer)

## Overview

- **ID:** `site-load-analyzer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** helliong
- **Category:** web-development
- **Daily users:** 1
- **Version:** 1.0.0
- **Last updated:** 2026-08-09
- **First published:** 2026-08-06
- **Size:** 257 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/site-load-analyzer/)
- **Website:** [https://helliong.space/](https://helliong.space/)

## Description

Site Load Analyzer adds a dedicated performance analysis panel to Firefox DevTools.

It helps developers quickly understand what affects a website’s loading performance without sending any data to external services.

Features:

• Page load and DOMContentLoaded timing
• Total transferred page size
• Number of network requests
• Cached, failed, and third-party request counts
• Resource breakdown by images, videos, JavaScript, CSS, fonts, and other files
• List of the 50 heaviest resources
• Automatic optimization recommendations
• Detection of heavy images, excessive JavaScript, missing compression, weak caching, and failed requests
• Filtering resources by type
• Exporting the complete analysis as a JSON report
• Light and dark theme support

How to use:
<ol><li>Open Firefox DevTools on the website you want to analyze.</li><li>Select the “Load Analyzer” panel.</li><li>Reload the inspected page while DevTools is open.</li><li>Review the collected metrics, heavy resources, and optimization recommendations.</li></ol>
Resource sizes are calculated from the HAR data provided by Firefox. When an exact transferred size is unavailable, the extension uses the resource content size as an estimate.

Privacy:

All analysis is performed locally inside Firefox DevTools. The extension does not collect, store, transmit, or share browsing data and does not require access to external services.

## Rankings

- #120,915 — Overall
- #126 — analyzer
- #181 — analyze

## Safety

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

### Analysis details

- Access to developer tools, typically low risk unless it's used to inspect or manipulate data improperly.
- 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/site-load-analyzer)