Modify Header Value

Add, modify or remove a header for any request on desired domains.

Modify Header Value: Firefox Add-on for HTTP Requests

"Modify Header Value" is a Firefox extension designed for app developers, website designers, and testers who wish to modify HTTP-request-headers. This extension enables users to easily add, change, or remove an HTTP-request-header for every request on the desired domains or URLs. One can deactivate or activate the add-on or individual header items with a simple toolbar icon click. The extension comes with an options page for the adjustment of each header item and an illustrative example on adding custom headers.
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View on Firefox Browser Add-ons

Add-on stats

Manifest V2
By: Milen
Daily users: 12,558
31
Rating: 4.00
(59)
Version: 0.1.8 (Last updated: 2022-08-01)
Version code: 5438789
Creation date: 2015-07-06
Weekly download count: 547
Firefox on Android: Yes
Permissions:
  • storage
  • <all_urls>
  • webRequest
  • webRequestBlocking
Size: 105.42K
URLs: Website
Full description: See detailed description

Ranking

# 702 ▲ 1
Other rankings
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Other platforms

Modify Header Value (HTTP Headers) (v0.1.9)
40,000 3.52 (46)
Not available on Android
Modify Header Value (HTTP Headers) (v0.1.9)
9,922 3.00 (4)

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Useful for security research and testing
  • Allows customization of headers easily
  • Works in private mode
  • Good alternative to other tools like Requestly
  • Effective for specific use cases like server authorization
Cons
  • Breaks YouTube functionality with modified User-Agent header
  • Issues with CORS protection
  • UI needs refinement
  • Limited options for editing response headers
Most mentioned
  • Need for editing response headers
  • Breakage of YouTube functionality
  • Request for updates and more features
  • Functionality in private mode is highlighted
  • Comparative advantage over other add-ons like Requestly
User reviews
by 退出中共邪教党团队避疫, 2025-02-13
Was alternatively using requestly to handle this specific use case, but with the direction they've been going this has been a really nice alternative
by Firefox user 18776916, 2025-01-11
As Security Researcher, I've found this add-on very useful. I never even had any bug or issue. Absolutely 5 stars!! <3 💯 ❤️
by Good Vibes, 2024-10-19
View all user reviews

Add-on safety

Risk impact

Modify Header Value requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

We don't have sufficient data to confidently determine the risk likelihood of Modify Header Value. Use it at your own risk.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
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