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ModHeaderHeader Editor
Free

Free browser extension with no sign-up.

 Free

Free and open source.

Browser extension Browser extension
  • Edits both request and response headers, including cookies
  • Filters rules by URL, tab or resource type
  • Edits request and response headers
  • Can modify response bodies
  • Only affects traffic from the browser
  • Closed source
  • Rule writing assumes some knowledge of HTTP
Browser extension Browser extension
Closed source Open source
License not stated License not stated
No account needed No account needed
Not stated if it works offline Works offline

Checked September 23, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.