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By the end of this page the extension is installed and a rule of yours is modifying live browser requests. The extension is the full toolkit, standalone — no other install required.

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Install

Install from your browser’s store:

Chrome

Edge

Firefox

Pin the extension to your toolbar — the icon is also where the popup opens from and where the badge shows rule activity.

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Create your first rule

  1. Open the popup and go to Rules.
  2. Create a rule — a request-header rule is the classic first one: pick the header name and value, and scope it to the sites it should apply on.
  3. Enable the rule and load a matching page. The Network panel shows the request with your modification applied.
Rules cover nine types over live traffic — headers, redirects, response overrides, and more — and apply through the browser’s own declarativeNetRequest engine, so they work even while the popup is closed.

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What else is in the box

Everything runs locally in your browser: a DevTools-grade network panel, a full API client (HTTP, GraphQL, gRPC, WebSocket, OAuth 2.0), workflows, an encrypted vault, and multi-workspace collaboration. Pair it optionally with the desktop app for git-backed sync, dynamic value sources, and a local proxy — the extension connects to it automatically when both run on the same machine.