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ChangeUser-Agent Extension

A browser extension that spoofs the browser user-agent string on every request.

Tech Stack

JavaScriptChrome Extensions APIManifest V3Content Scripts

About this project

Injects a custom user-agent header into all outgoing browser requests via a background service worker and content script. Ships with a user-agents.json database of real-world UA strings to rotate through, making the browser appear as a different device or browser to target sites.
Added May 2026