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postMessageObserver

Chrome extension by yishiashia · Productivity · Developer

  • Featured

A Chrome extension in Productivity · Developer with 913 users, barely installed. Audience over the last 30 days: -43.

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

What the developer says, and 1 screenshot

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

Users
913
Rating
5.0 (1 ratings)
Users, last 30 days
-43
Rating, last 30 days
Steady over 30 days
Version
1.0.0
Updated in the store
2023-10-24
Published
2023-10-24
Manifest
V3
Browser access
3 permissions, 1 site pattern

How it has moved

Users
-43 since 02.10
913-965 · 17 readings
  1. 2026-10-05932
  2. 2026-10-08941
  3. 2026-10-09949
  4. 2026-10-10956
  5. 2026-10-13961
  6. 2026-10-16943
  7. 2026-10-17937
  8. 2026-10-18932
  9. 2026-10-19938
  10. 2026-10-21950
  11. 2026-10-22947
  12. 2026-10-23950
  13. 2026-10-24965
  14. 2026-10-25963
  15. 2026-10-28952
  16. 2026-10-29945
  17. 2026-11-01913
Rating
unchanged since 02.10
reviewsrating 5.00 · 17 readings
  1. 2026-10-05reviews1rating5.00
  2. 2026-10-08reviews1rating5.00
  3. 2026-10-09reviews1rating5.00
  4. 2026-10-10reviews1rating5.00
  5. 2026-10-13reviews1rating5.00
  6. 2026-10-16reviews1rating5.00
  7. 2026-10-17reviews1rating5.00
  8. 2026-10-18reviews1rating5.00
  9. 2026-10-19reviews1rating5.00
  10. 2026-10-21reviews1rating5.00
  11. 2026-10-22reviews1rating5.00
  12. 2026-10-23reviews1rating5.00
  13. 2026-10-24reviews1rating5.00
  14. 2026-10-25reviews1rating5.00
  15. 2026-10-28reviews1rating5.00
  16. 2026-10-29reviews1rating5.00
  17. 2026-11-01reviews1rating5.00
Users
-46 since 01.09
913-972 · 32 readings
  1. 2026-09-01959
  2. 2026-09-02962
  3. 2026-09-04960
  4. 2026-09-05937
  5. 2026-09-06942
  6. 2026-09-08966
  7. 2026-09-09972
  8. 2026-09-13957
  9. 2026-09-15956
  10. 2026-09-17953
  11. 2026-09-20961
  12. 2026-09-21967
  13. 2026-09-25968
  14. 2026-09-27953
  15. 2026-09-28956
  16. 2026-10-05932
  17. 2026-10-08941
  18. 2026-10-09949
  19. 2026-10-10956
  20. 2026-10-13961
  21. 2026-10-16943
  22. 2026-10-17937
  23. 2026-10-18932
  24. 2026-10-19938
  25. 2026-10-21950
  26. 2026-10-22947
  27. 2026-10-23950
  28. 2026-10-24965
  29. 2026-10-25963
  30. 2026-10-28952
  31. 2026-10-29945
  32. 2026-11-01913
Rating
unchanged since 01.09
reviewsrating 5.00 · 32 readings
  1. 2026-09-01reviews1rating5.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-04reviews1rating5.00
  4. 2026-09-05reviews1rating5.00
  5. 2026-09-06reviews1rating5.00
  6. 2026-09-08reviews1rating5.00
  7. 2026-09-09reviews1rating5.00
  8. 2026-09-13reviews1rating5.00
  9. 2026-09-15reviews1rating5.00
  10. 2026-09-17reviews1rating5.00
  11. 2026-09-20reviews1rating5.00
  12. 2026-09-21reviews1rating5.00
  13. 2026-09-25reviews1rating5.00
  14. 2026-09-27reviews1rating5.00
  15. 2026-09-28reviews1rating5.00
  16. 2026-10-05reviews1rating5.00
  17. 2026-10-08reviews1rating5.00
  18. 2026-10-09reviews1rating5.00
  19. 2026-10-10reviews1rating5.00
  20. 2026-10-13reviews1rating5.00
  21. 2026-10-16reviews1rating5.00
  22. 2026-10-17reviews1rating5.00
  23. 2026-10-18reviews1rating5.00
  24. 2026-10-19reviews1rating5.00
  25. 2026-10-21reviews1rating5.00
  26. 2026-10-22reviews1rating5.00
  27. 2026-10-23reviews1rating5.00
  28. 2026-10-24reviews1rating5.00
  29. 2026-10-25reviews1rating5.00
  30. 2026-10-28reviews1rating5.00
  31. 2026-10-29reviews1rating5.00
  32. 2026-11-01reviews1rating5.00

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.

  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • Open a panel beside the page sidePanel

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

yishiashia.

Like this one

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

  1. postMessage-catcher Describes nearly the same job, smaller audience 2k users ★ 4.0
  2. PostMessage Tracker Describes nearly the same job, smaller audience 185 users ★ 5.0
  3. PostMessage Inspector Describes nearly the same job, smaller audience 395 users ★ 4.3
  4. Message Channel Tracker Describes nearly the same job, smaller audience 16 users
  5. DOMinator Describes a similar 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/kacefiaccibhgdjlmnclndfjdiolaeeb/badge.svg)](https://extops.dev/extensions/kacefiaccibhgdjlmnclndfjdiolaeeb)

HTML

<a href="https://extops.dev/extensions/kacefiaccibhgdjlmnclndfjdiolaeeb"><img src="https://extops.dev/extensions/kacefiaccibhgdjlmnclndfjdiolaeeb/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 2026-11-01. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built