ModHeader

ModHeader is the most popular Chrome extension to modify headers. It is fast, efficient, and light-weight. You can quickly enable/disable header modification with just 1-2 clicks.

ModHeader is free to use, with a paid option to unlock even more features and it works on Chrome, Firefox, Edge, and Opera.

What can ModHeader do?

• Add, modify, and remove request and response headers
• Use ModHeader to set X-Forwarded-For, Authorization, Access-Control-Allow-Origin, Content-Security-Policy, and your custom headers!
• Modify cookies in request / response header
• Advanced Content-Security-Policy editor
• Redirect URL to another

• Enable header modification by URLs

• Advanced filtering by tab, tab group, or window.

Key Features:

• Add comments to header
• One-click ‘undo’ if you made a mistake
• Support having multiple profiles with quick switching between profiles
• Export and import profile
• Easily share your profiles with others
• Customize autocomplete names and values
• Support for dynamic variables
• Sorting headers and name, value, or comments
• Append value to existing request or response header
• Dark mode support and more…

Website: https://modheader.com
Browser Extensions: Edge Browser Extension , Firefox Browser Extension