Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of Open Headers

Open Headers by Daniel T

Manage HTTP headers with static and dynamic sources and content auto-refresh. Dynamic sources: requests, env vars, files.

0 (0 reviews)0 (0 reviews)
4 Users4 Users
You'll need Firefox to use this extension
Download Firefox and get the extension
Download file

Extension Metadata

Screenshots
About this extension
Manage HTTP request headers with static and dynamic values to your specific domains. Reference the values from HTTP responses, environment variables or files.

Perfect for API testing, auth tokens, feature flags and multi-environment development.
  • Target specific domains with URL patterns
  • Format dynamic values with prefixes/suffixes
  • Save and manage multiple configurations
  • Import/export settings across devices
  • Get real-time updates when source content changes

Works with an optional companion app to access local system sources while maintaining complete privacy and security.

Open Headers <-> Open Source
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and dataLearn more

Required permissions:

  • Block content on any page
  • Access browser tabs

Optional permissions:

  • Access your data for all websites
More information
Add-on Links
  • Homepage
  • Support site
  • Support Email
Version
2.1.0
Size
428.94 KB
Last updated
2 months ago (Jun 3, 2025)
Related Categories
  • Web Development
License
MIT License
Privacy Policy
Read the privacy policy for this add-on
Version History
  • See all versions
Tags
  • privacy
  • search
  • security
  • user scripts
Add to collection
Report this add-on
More extensions by Daniel T
  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.