postMessage-catcher
A Chrome extension that captures the content of postMessage.
postMessage-catcher: Control and Debug Inter-frame Communication
"postMessage-catcher" is a Chrome extension specifically developed to create an efficient debugging environment. It captures all messages being posted and received on the current page, making it easy to monitor and debug communication instances with other iframes present on the page. It welcomes open-source contributions to the project on Github.
Extension stats
Manifest V2
Permissions:
- storage
Size: 768.00K
Email: ya*****@gmail.com
Full description: See detailed description
Other platforms
Not available on Android
Not available on Firefox
Not available on Edge
User reviews
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.
by 
Matt P, 2023-01-20
Matt P, 2023-01-20Extension safety
Risk impact
postMessage-catcher requires very minimum permissions.
Risk impact analysis details
- High Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
- Low ******* ****** ** *** ********* ********
Risk likelihood
We don't have sufficient data to confidently determine the risk likelihood of postMessage-catcher. Use it at your own risk.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Medium **** ********* *** *** **** *******
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Good **** ********* ********* ** * ******* ********* ** ****** *** *****
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