Firefox Extensions to System Info

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Provides comprehensive details about the core components of your computer, including CPU, motherboard, memory, and graphics card.

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WhatRuns

Free

WhatRuns is a powerful browser extension and web-based tool designed for developers, marketers, and researchers to instantly identify the technologies used on any website. From CMS to analytics, fonts, and more, it offers a comprehensive overview of a site's underlying stack, aiding in competitive analysis and web development insights.