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PerfDebugger — Real-time Web Performance

Chrome extension by karmesi · Productivity · Developer

A Chrome extension in Productivity · Developer with 6 users, barely installed. Audience over the last 30 days: unchanged.

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
6
Rating
not rated yet
Users, last 30 days
Unchanged
Version
1.0.0
Updated in the store
2026-10-23
Published
2026-04-21
Manifest
V3
Browser access
2 permissions, 1 site pattern

How it has moved

Users
unchanged since 30.09
4-7 · 11 readings
2026-10-23: released 1.0.0
  1. 2026-10-084
  2. 2026-10-095
  3. 2026-10-104
  4. 2026-10-135
  5. 2026-10-164
  6. 2026-10-185
  7. 2026-10-216
  8. 2026-10-225
  9. 2026-10-247
  10. 2026-10-296
  11. 2026-10-306
Users
unchanged since 01.09
4-7 · 25 readings
2026-10-23: released 1.0.0
  1. 2026-09-016
  2. 2026-09-025
  3. 2026-09-036
  4. 2026-09-045
  5. 2026-09-056
  6. 2026-09-065
  7. 2026-09-086
  8. 2026-09-095
  9. 2026-09-136
  10. 2026-09-157
  11. 2026-09-176
  12. 2026-09-215
  13. 2026-09-267
  14. 2026-09-286
  15. 2026-10-084
  16. 2026-10-095
  17. 2026-10-104
  18. 2026-10-135
  19. 2026-10-164
  20. 2026-10-185
  21. 2026-10-216
  22. 2026-10-225
  23. 2026-10-247
  24. 2026-10-296
  25. 2026-10-306

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times 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.

  • Schedule work to run later alarms
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 1.0.0 · Asked for fewer permissions (3, was 4) (changed: browser permissions)

What changed recently

  1. Now requires Chrome 111
  2. Package size changed
  3. Asked for fewer permissions (3, was 4) (changed: browser permissions)
Show the remaining 3
  1. Store description rewritten (103 → 121 characters)
  2. Renamed from "PerfDebugger - Frontend Performance" to "PerfDebugger — Real-time Web Performance"
  3. Released version 1.0.0 (was 0.1.0)

The publisher

karmesi publishes 2 listings we track, 9 users between them.

  1. The Proxy Magician karmesi · Productivity · Developer · published 2026-10-23 3 users

Like this one

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

  1. Realtime Profiler Describes nearly the same job, smaller audience 22 users ★ 5.0
  2. PerfLens Describes nearly the same job, smaller audience 3 users (last published figure)
  3. DevPulse Describes nearly the same job, smaller audience 11 users
  4. PerfMonitor – Web Performance & Core Web Vitals Monitor Describes nearly the same job, smaller audience 4 users
  5. Perflex Describes nearly the same job, smaller audience 10 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.

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The badge shows the audience and rating from our last pass over the store and links back to this page.

Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/mbleeeedeaibpokcllphdlpnbpaojjcm/badge.svg)](https://extops.dev/extensions/mbleeeedeaibpokcllphdlpnbpaojjcm)

HTML

<a href="https://extops.dev/extensions/mbleeeedeaibpokcllphdlpnbpaojjcm"><img src="https://extops.dev/extensions/mbleeeedeaibpokcllphdlpnbpaojjcm/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>

Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-10-29. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built