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HTTP Header Spy

Chrome extension by Michiel Roos · Productivity · Developer

A Chrome extension in Productivity · Developer with 8 000 users, a small but real audience.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
8 000
Rating
3.8 (61 ratings)
Users, last 10 days
+1k
Rating, last 30 days
Not watched long enough to say
Version
3.0.0
Updated in the store
2026-09-05
Published
2013-06-17
Manifest
V3
Browser access
5 permissions, 2 site patterns

How it has moved

Users
+1k since 06.09
7k-8k · 3 readings
2026-09-06: appeared in the store
  1. 2026-09-067kappeared in the store
  2. 2026-09-088k
  3. 2026-09-158k
Rating
unchanged since 06.09
reviewsrating 3.84 · 3 readings
2026-09-06: appeared in the store
  1. 2026-09-06reviews61rating3.84appeared in the store
  2. 2026-09-08reviews61rating3.84
  3. 2026-09-15reviews61rating3.84
Users
+1k since 06.09
7k-8k · 3 readings
2026-09-06: appeared in the store
  1. 2026-09-067kappeared in the store
  2. 2026-09-088k
  3. 2026-09-158k
Rating
unchanged since 06.09
reviewsrating 3.84 · 3 readings
2026-09-06: appeared in the store
  1. 2026-09-06reviews61rating3.84appeared in the store
  2. 2026-09-08reviews61rating3.84
  3. 2026-09-15reviews61rating3.84

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

  • See the address and title of every tab you have open tabs
  • Watch the network requests your browser makes webRequest
  • Run its own code on the pages it can access scripting
Show the remaining 2
  • Act on the current tab, but only after you click it activeTab
  • Store data in your browser storage

The full permission history for this extension

What changed recently

  1. Appeared in the store

The publisher

Michiel Roos publishes 2 listings we track, 8k users between them. Listed website: michielroos.com.

  1. Xposer Michiel Roos · Productivity · Developer · published 2019-12-07 23 users

Like this one

Listings the catalog judges closest in what they say they do.

  1. HTTP Headers Describes nearly the same job, with an established audience 10k users ★ 4.6
  2. HTTP Headers Inspector Describes nearly the same job, smaller audience 84 users
  3. HeaderPilot Describes nearly the same job, smaller audience 14 users ★ 5.0
  4. HTTP Header Tracker Describes nearly the same job, smaller audience 19 users
  5. Header Grep Describes nearly the same job, smaller audience 34 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.