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Override the new tab page with a blank one

Override JS, CSS, and API responses in your browser for safe debugging — without touching production.

Override fonts on any website. Set a global font or per-site overrides with full typographic control.

Redirect or mock requests (URL→URL or URL→text), modify headers, and inject JS/CSS. MV3-compatible alternative to Resource Override.

Override your new tab page to a custom URL.

Modify request headers, response headers, and cookies with local URL rules and profiles.

Intercepts network requests and serves content from a local server, keeping the original URL intact.

MAL History Override as the name suggests, overrides the history of the browser

Customize playback shortcuts on Netflix. Unofficial extension, not affiliated with Netflix.

Local file overrides and cache-free reload for Dynamics 365 developers

Override geolocation for web development and testing. Supports manual coordinates and route simulation with KML/GPX/GeoJSON files.