Site Load Analyzer by helliong

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:

1. Open Firefox DevTools on the website you want to analyze.
2. Select the “Load Analyzer” panel.
3. Reload the inspected page while DevTools is open.
4. Review the collected metrics, heavy resources, and optimization recommendations.

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.