The best extension to modify headers

ModHeader is a devtool used to quickly change request and response headers.

Install ModHeader:
ModHeader screenshot 1
ModHeader screenshot 1


ModResponse is a web developer tool that allows you to modify HTTP response body, status code, and headers. With ModResponse, you can test your local changes on your production domain within seconds.

Why ModHeader

ModHeader is fast, efficient, and light-weight. You can quickly enable/disable header modification with just 1-2 clicks.
ModHeader allow you to restrict your modification to just one tab, a window, or only to a certain site.
Easily export and share your profiles with others. Automatically backup your changes to the cloud.
ModHeader is available on Chrome, Firefox, Edge, and Opera on Windows, MacOS, and Linux.
ModHeader does not inject ad or sell your data.

What can ModHeader do?

Core features
  • Add, modify, and remove request and response headers
  • Use ModHeader to set X-Forwarded-For, Authorization, Access-Control-Allow-Origin, etc.)
  • Modify cookies in request / response header
  • Redirect URL with another
  • Enable header modification by URLs
  • Advanced filtering by tab, tab group, or window
More features
  • Add comments to header
  • One-click "undo" if you made a mistake
  • Multiple profile support
  • Quick switch between profiles
  • Export and import profile
  • Easily share your profiles with others
  • Customize autocomplete names and values
  • Dark mode support
  • Sorting headers and name, value, or comments
  • Append value to existing request or response header
  • Customizable profile badge
  • Clone profile
  • Cloud backup
  • ...and more!


Modify request and response headers
Modify request and response headers
Cookie modifications
Cookie modifications
Filter by tab and windows
Filter by tab and windows
Filter by URL and resource
Filter by URL and resource
Share profile by URLs
Share profile by URLs
Multiple profile support
Multiple profile support
Help and Support
Looking for helps? Head over to our documentations.
You can also contact us.
Source codes
Our source code is available on GitHub . Feel free to examine it to make sure it doesn't do anything malicious.
Need to use ModHeader in Selenium WebDriver, please check out ModHeader for selenium on GitHub