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Browser Extensions & Plugins

Header Override

Open-source browser extension to modify HTTP request and response headers and cookies

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DR by Ahrefs
8 no change since last check

Ahrefs Domain Rating benchmarked 25 Oct 2026, rebuilt 25 Oct 2026.

Header Override metrics

Benchmarks for headeroverride.com: Ahrefs Domain Rating and Majestic link data, with the change since the last build.
MetricValue
Domain Rating8 no change since last check
Trust Flow3 no change since last check
Citation Flow18 no change since last check
Referring domains13 no change since last check
External backlinks20 no change since last check

Ahrefs Domain Rating benchmarked 25 Oct 2026, rebuilt 25 Oct 2026. Main build topic: Computers/Software/Operating Systems (3). Majestic benchmarked 25 Oct 2026, rebuilt 25 Oct 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Header Override domain build sheet

Public RDAP record, last read 25 Oct 2026, 17:58 UTC.
Domain age3 months
Registered
Expires
RegistrarCloudflare, Inc.
DNSSECNot signed

Inspect headeroverride.com's registration

A free, open-source Chrome, Firefox, and Edge extension for modifying HTTP headers, cookies, and testing APIs with local rules that never leave your browser.

What it is

Screenshot of the Header Override homepage
headeroverride.com, as visitors see it

Header Override is an open-source browser extension available for Chrome, Firefox, and Edge that allows you to modify HTTP request and response headers, inject custom headers and cookies, and test APIs with switchable local profiles. All rules are stored locally in your browser and never sent to external servers. The extension includes a header editor for adding and modifying headers, URL filtering to scope rules to specific websites, cookie management with customizable attributes, profile support for different projects and test setups, and import/export functionality. It is designed as a lightweight, privacy-focused alternative to ModHeader for API debugging and testing.

What it is built with

  • Modify request and response headers with a focused editor interface
  • Scope rules to specific URLs using browser-supported filter patterns
  • Customize response cookies with Domain, Path, SameSite, Lifetime, Max-Age, and Secure attributes
  • Create up to five local rule profiles for different projects and test setups
  • Import and export profiles as local JSON files between browsers
  • Enable, disable, delete, and annotate rules with comments
  • Support for Chrome, Edge, and Firefox
  • All rules stored locally in browser with no server transmission

Pricing

Pricing model: Open source

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Questions from the bench

What is Header Override?
Header Override is a browser extension that lets you modify HTTP headers and cookies.
Is Header Override an alternative to ModHeader?
Yes. Header Override is an open-source, lightweight ModHeader alternative for modifying request headers, response headers, request cookies, and response cookies with local browser rules.
Are rules sent to a server?
No. Rules are stored locally in browser extension storage and are used only to apply the header or cookie changes you configure.
Can rules target specific URLs?
Yes. Header and cookie rules can be scoped with browser-supported URL filter patterns, so changes apply only to matching requests.
Why does Header Override request access to websites?
Header Override needs access to all URLs because you can create rules for any website and scope them with URL filters. No rule data or browsing activity is transmitted to the developer or developer-controlled servers.

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More on this profile

Header Override has a free listing. The owner can unlock the full profile with a paid launch for $5:

  • Founder story (locked)
  • Milestones (locked)
  • Demo video (locked)
  • Dofollow website link (locked)

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