ModHeader review

ModHeader is a browser extension for changing HTTP request and response headers without changing your app’s code. It supports Chrome, Firefox, and Edge, and does not require sign-up, according to the published product information.

You can use it to add or edit headers such as Authorization and X-Forwarded-For, then switch those changes on or off. Rules can be limited by URL, tab, window, or resource type, which helps keep a test change from applying everywhere.

The extension also edits Cookie and Set-Cookie headers, lets you draft and try Content-Security-Policy response headers, and supports separate profiles for different projects or environments. Profiles can be imported and exported. That makes ModHeader a focused tool for browser-based header testing—not a replacement for a broader API client or development environment.

ModHeader’s main advantage is that it puts request and response header changes in the browser, where you can test them against a site without editing application code. The controls cover more than simple request-header injection: the published feature list includes response headers, cookies, and CSP testing too.

Rules can be scoped by URL, tab, window, or resource type, and toggled with one click. Profiles let you keep settings separate across projects or environments, then export or import them. That is a useful setup for people who need different header rules for different testing contexts.

The pricing listing shows two free options:

• Free (With Limits): $0 per month, up to 10 rules and 3 profiles, with profile sharing publicly or with a few people.
• Free (Ad-sponsored): $0 per month, unlimited rules and profiles, plus ModResponse Pro, but with an ad-supported experience.

For one person who wants ad-free use, the listing puts Basic at $4 per user per month, with unlimited rules and profiles. No sign-up requirement also keeps the initial setup simple.

The free plan has a real ceiling: 10 rules and 3 profiles. The other free tier removes those caps, but it is ad-supported. Basic costs $4 per user per month and is listed for one user; annual billing prices are not published. The listing gives no free-trial terms, and no add-ons are listed.

There is also a trust problem in the user reports. Reddit threads describe ads or unexpected tabs, and one thread says Google flagged the extension as malware and Microsoft removed it from Edge. Those are reports, not proof of what happened or what data was involved. A commenter in another thread said the ad-free version still inserted ads. We would treat these as serious warnings, not verified findings.

If you handle company accounts or sensitive browsing, check the current store listing and your organization’s extension policy before installing or keeping ModHeader. The feature set may be useful, but the ad-supported option and reported security concerns make it harder to recommend without qualification.

ModHeader lists two free options and one paid plan. Free (With Limits) costs $0 and allows up to 10 rules and 3 profiles. Free (Ad-sponsored) also costs $0, but includes unlimited rules and profiles, plus ModResponse Pro, in an ad-supported experience. The paid Basic plan is $4 per user per month for one user, with unlimited rules and profiles and no ads.

The practical price jump is from $0 to $4 per user monthly if you want unlimited use without ads. You don't have to pay for unlimited rules if you accept ads; the ad-sponsored plan includes them. The pricing details list monthly prices, but annual billing prices are not published, so there’s no verified annual discount to compare. No add-ons are listed. The free-with-limits tier may suit occasional personal use, but its 10-rule and 3-profile caps are worth checking against your workflow before switching.

Switching to ModHeader is a browser-extension change: it supports Chrome, Firefox, and Edge, and requires no sign-up. Its profiles can be exported and imported, which gives you a way to carry ModHeader profiles between setups. The published details do not specify an importer for rules from other header tools, so assume those may need to be recreated unless you confirm otherwise.

If you leave, export the profiles you want to keep before removing the extension. The product details do not say what happens to profile data after uninstalling, so don’t treat uninstalling as a backup. Reddit users report concerns about ads and malware flags; those reports may be a reason to leave, especially where extension security policies are strict. They are reports, not proof that every installation is affected. If dependable ad-free use is the sticking point, Basic is listed at $4 per user monthly; the free alternative with unlimited rules is ad-supported.