postMessageObserver
A Chrome extension that allows you to observe the flow of postMessage messages on the side panel.
postMessageObserver
Add-on stats
Risk impact: Moderate risk impact 
Risk likelihood:
Manifest version: 3
Permissions:
- scripting
- activeTab
- sidePanel
Host permissions:
- https://*/*
Size: 127.91K
URLs: Website
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Firefox
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Add-on summary
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
Add-on safety
Risk impact
postMessageObserver requires a few sensitive permissions. Exercise caution before installing.
Risk likelihood
postMessageObserver has earned a fairly good reputation and likely can be trusted.
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