User Agent and JS Manager

Advanced User-Agent switcher with per-site JavaScript and Cookie controls.

A developer tool for testing website compatibility and functionality across different environments. Instantly see how your site appears to search crawlers, social media platforms, and various browsers by switching user agents. Debug JavaScript-dependent features like form submissions and server-side rendering by toggling script execution. Configure User-Agent, JavaScript, and Cookie settings on a per-site basis with automatic persistence. Features: - Switch User-Agent to test how crawlers and different browsers view your site - Toggle JavaScript to debug form-based workflows and progressive enhancement - Block outgoing cookies for specific sites to test privacy and authentication scenarios - Configure settings individually for each website - Settings automatically apply when you revisit sites Common Uses: - Verify how search crawlers and social platforms see your pages - Test form submissions and server-side rendering without JavaScript - Debug graceful degradation in JavaScript-optional sites - Manage privacy settings for specific domains Privacy: All data is stored locally on your device. No browsing information is collected or transmitted. Permissions: - DeclarativeNetRequest: Modifies HTTP headers - ContentSettings: Controls JavaScript execution - Storage: Saves your preferences