The Netlify Lighthouse Integration allows users to access Google Lighthouse auditing tool directly on their deploys, providing a full report on performance, accessibility, SEO, and more. The plugin offers various features, including custom settings for specifying subdirectories, failing builds based on scores, and setting the type of experience. New features include serving only a specified subdirectory, failing builds when a score isn't met, setting locale and language for reports, and running Lighthouse audits for desktop experiences. Users can install the plugin with a one-click install or configure it through the netlify.toml file. The plugin is available in the latest version of 4.0, and users need to have the latest version to access all the new features.