Iframe Broker by Vinoth Kumar

This extension allows you to see the cross window/frame communication happening behind the current tab. You can see in the console logs for the communication message or click the extension icon to see the messages.

This extension is an opensource project https://github.com/vinothsparrow/iframe-broker
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Free.
Open-source with public license (MIT)
For users by users.

If ever you really do want to contribute something, think about the people working hard to maintain the filter lists you are using, which were made available to use by all for free.

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Project changelog:
https://github.com/vinothsparrow/iframe-broker/releases

Contributors @ Github:
https://github.com/vinothsparrow/iframe-broker/graphs/contributors