Request headers
Add or replace outgoing HTTP request headers for matching URL patterns.
ModHeader alternative
ModHeader alternative
Header Override is an open-source, lightweight browser extension for developers, QA engineers, and support teams who need a focused alternative to ModHeader for scoped request headers, response headers, and cookies.
Why switch
A local header modifier without accounts or tracking.
Header Override keeps the workflow small: create a rule, choose the request or response behavior, scope it to matching URLs, and keep profiles for the setups you reuse. Rules are saved locally in your browser and are not sent to the developer. The project source is public on GitHub so the extension can be reviewed directly.
Response headers
Apply response header changes from the same focused browser extension popup.
Cookies
Override request cookies and response Set-Cookie values, including common response cookie attributes.
Profiles
Keep separate local setups for projects, clients, environments, and test accounts.
Local storage
Rules stay in browser extension storage and are not sent to a developer server.
No tracking
No analytics, advertising, tracking, remote code, or external service dependency.
Open source
The extension source is public on GitHub for review, issue reports, and contributions.
Search intent
A focused modify header browser extension with local rules.
If you need to modify HTTP headers in Chrome, Edge, or Firefox, Header Override gives you request header, response header, request cookie, and response cookie rules in one local extension.
It keeps ModHeader alternative comparisons focused on a smaller local workflow.
Is Header Override an alternative to ModHeader?
Yes. Header Override is a browser extension for users who need to modify HTTP headers and cookies with scoped local rules. It focuses on a small, privacy-first workflow rather than a broad debugging platform.
Can Header Override modify request and response headers?
Yes. Header Override supports request header rules and response header rules, and each rule can be scoped to browser-supported URL filter patterns.
Does Header Override store rules on a server?
No. Header Override stores rules locally in browser extension storage and does not transmit your rules, browsing activity, or website content to the developer or third parties.