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Preview of Open Headers

Open Headers by OpenHeaders

Your existing Web DevToolkit, inside a browser extension. Modify live browser requests. Manage API Collections. Team Collaboration.

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Manage your active header rules — inject tokens, auth headers, and more across any domainModify headers, payloads, query params, block or redirect requests, inject scripts and CSS
About this extension
Your existing Web DevToolkit inside a browser extension.
  • Modify live browser requests. Manage API Collections. Team Collaboration
  • Work offline -> Auto-sync when back online
  • Chain & Schedule API Requests
  • Front-end and back-end inside the browser extension: no other tool on the market ships this
  • Local-first: no account, no cloud

Our vision: We provide a platform where everyone can use local tools to generate their own local data and own it, not a cloud vendor middleman.

Everything is free to use and free to self-host. Like it should be.
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Permissions and data

Required permissions:

  • Clear recent browsing history, cookies, and related data
  • Block content on any page
  • Read your browsing history
  • Extend developer tools to access your data in open tabs
  • Control browser proxy settings
  • Access browser tabs
  • Access browser activity during navigation
  • Access your data for all web sites

Optional permissions:

  • Access your data for all web sites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
2026.7.11
Size
5.71 MB
Last updated
3 days ago (21 Jul 2026)
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Licence
All Rights Reserved
Version History
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