Header Sets

by Usehashmap.com · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Define sets of HTTP request headers and activate one set at a time while browsing.

Users

+4 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#189K

#158K among extensions

Version

1.0.0

updated 12 Jul 2026

Users

monthly, 3 months

Latest, 16 Oct 2026: 11 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 Header Sets

Header Sets lets you define named groups of HTTP headers and activate one group at a time while you browse. Built for developers who juggle environments: staging auth tokens, API keys, locale overrides, CORS testing. ★ Sets, not single headers — group the headers that belong together ("Staging auth", "QA locale") and switch with one click ★ Scope each set to specific sites with a URL filter (*.myapp.dev, localhost, https://api.example.com/v1/*) so tokens never leak elsewhere ★ Request AND response headers — set, append, or remove either direction (e.g. add Access-Control-Allow-Origin: * for CORS testing) ★ Toggle individual headers on/off to compare behavior ★ Export/import sets as JSON to share configs with your team ★ Toolbar badge shows which set is active; invalid or sensitive header names are flagged as you type ★ Follows your OS light/dark theme Built on Chrome's declarativeNetRequest API: headers are applied by the browser's rule engine, with no JavaScript intercepting your traffic and no performance overhead. Privacy: everything stays in your browser. No accounts, no analytics, no remote servers — see the privacy policy.