The best extension to modify headers

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

About 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, or only to a certain site.
Automatically backup your changes to the cloud. You can also export and share your profiles.
ModHeader is available on Chrome, Firefox, Edge, and Opera on Windows, MacOS, and Linux.
ModHeader does not inject ad or collect your data.

What can ModHeader do?

  • Add/modify/remove request and response headers.
  • Use ModHeader to set X-Forwarded-For, Authorization, Access-Control-Allow-Origin, etc.)
  • Enable header modification based on URL/resource type
  • Add comments to header
  • Multiple different profiles
  • Sorting headers by name, value, or comments
  • Append value to existing request or response header
  • Export and import header
  • Clone profile
  • Cloud backup
  • Tab locking!
  • Replace URL with another (great for testing with localhost!)


Help and Support
Looking for helps? Head over to our guide page.
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.