What it does

Nex Tab Cost is a production-ready Chrome Extension (Manifest V3) that calculates and displays the real-time resource cost of open browser tabs. It uses a sophisticated heuristic engine to estimate memory usage based on domain weight, activity status, and media playback. The extension provides a toolbar badge with color-coded severity levels, a dashboard for managing heavy tabs, and gamified achievements to encourage lean browsing habits.

Why use this skill

Unlike basic scaffolding tools, this skill delivers a fully functional, previously shipped product. It follows a "no-build" philosophy—using vanilla JavaScript, HTML, and CSS—eliminating the need for complex toolchains, Webpack, or NPM dependencies. It's the perfect solution for developers who need a hardened MV3 starting point or an immediate utility for tab management.

Output & Features

• Complete source code including Manifest V3 service workers and popup dashboards.
• Heuristic weighting database (heavysites.json) for accurate memory estimation.
• Gamification engine with five unlockable achievement badges.
• CSV export functionality for historical resource usage tracking.
• Step-by-step guidance for Chrome Web Store packaging and deployment.