Open Resource Override (MV3)

About

Open Resource Override is a developer tool for intercepting and overriding network requests directly in your browser.

FEATURES
• Redirect a URL to another URL.
• Mock any request with custom text/JSON (immediate via redirect, or "after response" via fetch/XHR with arbitrary status codes).
• Match POST/PUT requests by HTTP method and request body (contains / equals / regex).
• Modify response headers (add, set, remove) with optional CORS exposure.
• Inject custom JavaScript or CSS into pages.
• Wildcard or regex URL matching, with exclusion patterns and a built-in "Test match" tool.
• Manage rules from the popup, a full options page, or a dedicated DevTools panel.
• Three themes (DevTools Pro, Clean Light, Terminal) with light/dark/system modes.

All rules are stored locally in your browser. No data is collected, transmitted, or shared.

This is an MV3-compatible, open-source alternative to the classic Resource Override extension.