Header Modifier

Take control of HTTP headers on a per-domain basis. Add, remove, or rewrite request and response headers, block unwanted requests, and redirect traffic, all organized into switchable profiles. Everything else stays untouched. Set up a profile for your dev environment with auth tokens and CORS headers. Set up another for debugging with custom trace IDs. Switch between them from the popup without touching your rules. - 🔧 Modify request and response headers: set, append, or remove - 🎯 Target by domain, subdomains, URL pattern, or regex - 🚫 Block matching requests before they leave your browser - 🔀 Redirect matching requests to a different URL - 👤 Switch between profiles (Dev, Staging, Debug CORS) with one click - 🔄 Drop in dynamic placeholders: `{{uuid}}`, `{{timestamp}}`, `{{random_int}}` and 13 more - 🔍 Filter rules by HTTP method: GET, POST, PUT, DELETE, and others - 📤 Export and import profiles and rules as JSON - ↕️ Drag and drop to reorder rules - 📋 Duplicate rules and detect when they shadow each other - ⏹️ Toggle the whole extension off without losing your rules - 🌍 Available in English, Spanish, Chinese, Hindi, and Russian - 🚫 No ads, no tracking, completely free and open source