Reviews of Modify Header Value

By: Milen

List of user reviews and ratings for Modify Header Value

Total ratings

3.62 (Rating count: 66)

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Review summary

Summary: Users generally value the core ability to add and tweak HTTP headers in the browser and view it as a useful tool, sometimes as a strong alternative to similar extensions. However, many reviews note reliability problems (headers may not be applied or only affect the first request), a confusing UI, breakage after updates (including MV3 changes), and that it doesn’t affect client-side XHR/fetch requests. Some sites can break when altering headers (e.g., YouTube). Overall, it’s helpful when working, but stability and scope issues limit its consistency.

Pros

Core feature: enables adding and adjusting HTTP header values in browser requests.
Useful for testing and security scenarios; described as very useful by a security researcher.
Provides a good alternative to similar extensions (e.g., Requestly).
Gives flexibility to tweak any header you desire.

Cons

Unreliable header changes: changes may not apply consistently and often affect only the first request.
Update-induced breakage: updates can break the add-on or limit its functionality (e.g., MV3 changes).
UI/UX unclear: enable/disable state isn't clearly indicated.
Does not affect client-side XHR/fetch requests.
Can cause site breakages (e.g., YouTube) when modifying certain headers.

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User Reviews

Recent rating average: 2.00

All time rating average: 3.62

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14% (10)

Date	Author	Comment
2026-04-13	S.*****	Not working
Not working
2026-03-18	No*****	Can't change existing header after adding it. Even when you add a new header, it is not reliably added. I wish the old ModHeader extension was still available.
Can't change existing header after adding it. Even when you add a new header, it is not reliably added. I wish the old ModHeader extension was still available.
2025-08-10	Fi*****