HeaderFlex - Modify HTTP Requests icon

HeaderFlex - Modify HTTP Requests

by knothhe · headerflex.app · Developer Tools
Established publisherManifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

ModHeader alternative: modify headers, redirect/block, mock APIs, inspect rule hits, re-inject responses. 100% local, zero upload.

Users
49
+14 in 30 days
Rating
4.5 / 5
unchanged in 30 days
Ratings
2
0 in 30 days
Store rank
#109K
#91K among extensions
Version
1.0.11
updated 14 Sep 2026

Users

monthly, 3 months
02449Jul 2026Sep 2026Oct 2026
Latest, 16 Oct 2026: 49 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 months
012Jul 2026Sep 2026Oct 2026
Latest, 16 Oct 2026: 2 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About HeaderFlex - Modify HTTP Requests

Modify request & response headers with profiles, URL matching and declarativeNetRequest — fully local, no accounts, no tracking.

Growth

WindowUsersChangeRatingsRating
7 days+11+28.9%00.00
30 days+14+40.0%00.00

Chrome Web Store search rankings

Where HeaderFlex - Modify HTTP Requests appears when people search the store, with the 30 day change
Search phrasePosition30 days
modify#41+23

Version history

4 versions recorded
1.0.1114 Sep 2026
1.0.105 Aug 2026
1.0.821 Jul 2026
1.0.516 Jul 2026

Details

Category
Developer Tools
First seen
16 Jul 2026
Size
2.0 MB
Languages
en, zh-CN
Pricing
Free
Privacy policy
headerflex.app
Support
headerflex.app
Extension ID
nihfajmdncbbhlnpepklhlgeddbhpdlb

Permissions and risk

Elevated riskimpact 4, likelihood 2
Permissions
sidePanelstoragedeclarativeNetRequestdeclarativeNetRequestWithHostAccessclipboardReadoffscreendebuggerdownloadstabCapturedesktopCapture
Site access
<all_urls>
Can read and change data on every website you visit.

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