Gecko
Developer Tools
Automated CSPT discovery tool
Users
569
Rating
5.0
Reviews
3
7D Growth
-7|-1.22%
Stable signalUnknownMedium-risk permissions
postMessage-catcher
A Chrome extension that captures the content of postMessage.
Users1KCurrent public install base
Rating4.0Store average score
Reviews4Public review volume
Manifest versionV3Extension platform version
7-day growth0Net users gained this week
7-day growth rate0%Relative weekly velocity
Preview
1 assetspostMessage-catcher Media preview
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7-day rating change
Start
4.00
Latest
4.00
7-day rating change
0.00
2026年7月14日2026年7月20日
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1-day growthFlat
00%7-day growthFlat
00%30-day growthDeclining
-1K-50%Technical snapshot
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Version2.0.0
ManifestV3
Size2.25MiB
Languages1English (United States)
Published
Store updated
Last crawled
English (United States)
Overview
Product summary
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An effective development tool to help you capture all messages posted and received on the current page.
It aims to provide an easier debugging experience when you need to communicate with other iframes.
Contributions are welcome to the Github project.
Reviews
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Store average score4.0Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average1.0Average computed only from synced review bodies below
Reviews with text1Synced review bodies
Total ratings / reviews4Chrome Web Store public rating/review count
Store average score: 4.0. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
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Tried this in Jan 2023 to understand how the youtube javascript embed API interacts over postMessage. This extension doesn't catch or report any of the postMessages that may happen in sub-iframes (e.g. not in the top window). So if you prototype something in codepen or whatever you won't see the postMessages in this extension. It appears (limited testing) it only reports postMessages RECEIVED by the top window...so you don't even see postMessages sent by the top window to child iframes. This makes this extension pretty useless as you can add a single "message" listener that logs messages in the devtools console to accomplish the same thing.