Live Resource Override

Live Resource Override lets you intercept and modify web resources directly in your browser — no proxy tools, no production deployments, no risk.

Key Features:

• Override JavaScript, CSS, HTML, and API responses on any website
• Redirect requests to local or remote files
• Modify HTTP response headers
• Block unwanted requests
• Inject custom JavaScript and CSS into any page
• Group rules by project with enable/disable toggles
• URL matching with contains, equals, wildcard, and regex patterns
• Domain and resource type filtering
• Import/export rule configurations
• Full editor UI for managing complex rule sets

Use Cases:

• Debug production issues safely without pushing code changes
• Test JavaScript fixes before deploying to a live environment
• Mock API responses for frontend development
• Block analytics or tracking scripts during testing
• Override CSS to prototype design changes in real-time

How It Works: Create override rules that match URLs by pattern. When a matching request is detected, Live Resource Override intercepts it and applies your modification — whether that's replacing the response body, redirecting to a different file, injecting code, or modifying headers. All changes are session-only and never touch your production environment.

Built with Manifest V3 for security and performance. All data stays local in your browser — nothing is sent to external servers.

Permissions explained:

• Storage: Save your override rules locally
• DeclarativeNetRequest: Intercept and redirect network requests
• Tabs: Detect the active tab's URL for rule matching
• Host permissions: Apply overrides on any website you choose