Check a Site - Scan websites for over 700 quality problems
Stylebot - Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me
Beta Family - 50,000 testers to test your app
Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
Sqreen - Sqreen is a web application security monitoring and protection solution helping companies protect their apps and users from attacks. Get started in minutes.
Stylus - User Styles Manager - Stylus is a userstyles editor and manager based on the source code of Stylish version 1.5.2.