postMessageObserver
A Chrome extension that allows you to observe the flow of postMessage messages on the side panel.
As of May 2026, postMessageObserver has 944 users and a 5.00/5 rating from 1 reviews in the Developer Tools category.
Usersup 6.2 percent+6.2%
944
944
Ratingno change0%
5.00
1 reviews
Reviewsno change0%
1
Version
1.0.0
Manifest V3
History
2 snapshotsTracking since Apr 25, 2026.
View as table
| Date | Users | Rating | Reviews | Version |
|---|---|---|---|---|
| Apr 25, 2026 | 889 | 5.00 | 1 | 1.0.0 |
| May 22, 2026 | 942 | 5.00 | 1 | 1.0.0 |
| Now | 944 | 5.00 | 1 | 1.0.0 |
Permissions & access
- Permissions
- scriptingactiveTabsidePanel
- Host access
- https://*/*
Screenshots
About
Chrome PostMessage Observer provides a convenient side panel to view postMessages for the current page. This extension offers a user-friendly UI that simplifies the debugging and observation of message flows between iframes and the top window. Easily intercept and analyze postMessage messages, view their payload, source, and target details, and efficiently troubleshoot communication issues within web applications. Contributions are welcome to the GitHub project, which can be found here: https://github.com/yishiashia/chrome-postmessage-observer
Technical
- Version
- 1.0.0
- Manifest
- V3
- Size
- 23.07KiB
- Min Chrome
- 88
- Languages
- 1
- Featured
- Yes
Metadata
- ID
- kacefiaccibhgdjlmnclndfjdiolaeeb
- Developer ID
- u9582ff1bddfcb38a3d7962fb67365be7
- Developer Email
- [email protected]
- Created
- Oct 24, 2023
- Last Updated (Store)
- Oct 24, 2023
- Last Scraped
- May 22, 2026
- Website
- —
- Privacy Policy
- —
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Data sourced from the Chrome Web Store · last verified May 22, 2026.