Add a Custom Request Header in Chrome

Add the value, limit it to the intended request URLs, then verify the outgoing request in DevTools.

TL;DR: Install VibeHeader, add the header to a Profile, create a Request Filter for the target site, test the exact URL, and reload. Share the complete Profile only through a trusted channel.

  1. Install the Chrome header editor.
  2. Create a rule with your header name and value, scoped to your domain.
  3. Verify in DevTools → Network that the header is added.
Install for Chrome Manual install More ways to modify headers
VibeHeader 1.1 editing two request headers with a Request Filter active on the current tab