Custom Header

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Easily add, manage, and inject custom HTTP headers into every browser request. A lightweight and elegant alternative to ModHeader.

Users

+14 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#109K

#91K among extensions

Version

1.1.3

updated 17 Jul 2026

Users

monthly, 3 months

Latest, 16 Oct 2026: 50 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 months

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Custom Header

Custom Header lets you add custom HTTP headers to every network request directly from your browser — perfect for developers, QA engineers, and API testers. Features: - Add unlimited custom request headers (key-value pairs) - Toggle individual headers on/off instantly - Master toggle to enable/disable all headers at once - Headers persist across browser sessions - Works on all network requests (XHR, fetch, images, scripts, etc.) - Clean, modern dark UI - Lightweight — no bloat, no tracking, no permissions beyond what's needed Use cases: - Add Authorization or API key headers for testing - Simulate custom client headers for debugging - Inject X-Forwarded-For or other proxy headers - Override Accept-Language or Content-Type headers Built with Manifest V3 and the declarativeNetRequest API for maximum performance and security.