Open Headers by Daniel T
Your existing Web DevToolkit, inside a browser extension. Modify live browser requests. Manage API Collections. Team Collaboration.
4 Users4 Users
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About this extension
Your existing Web DevToolkit inside a browser extension.
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. Like it should be.
Everything is free to use and free to self-host.
- 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
- Open core, honestly labeled: the UI, shell, and core are MIT-licensed and public
- Local-first: no account, no cloud, zero telemetry
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. Like it should be.
Everything is free to use and free to self-host.
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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
- Access browser tabs
- Access browser activity during navigation
- Access your data for all websites
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 2026.7.0
- Size
- 3.86 MB
- Last updated
- a day ago (Jul 4, 2026)
- Related Categories
- License
- MIT License
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection