JustZix

About

JustZix is a no-cost Chrome extension that enables users to apply custom CSS and JavaScript to any webpage based on URL patterns. It provides integrated developer panels within the tab, including a CSS editor, a JavaScript editor, a JavaScript REPL console, and a six-tab output console for logs, network requests, errors, and the GTM dataLayer. This allows for editing, debugging, and customizing websites directly without opening DevTools. You can remove banners, enable dark mode, test GTM configurations, label development or staging environments, or create persistent minor page adjustments. The extension does not require an account and collects no usage data.