Iframe Broker - Firefox Add-on
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Add-on summary
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
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.
Project changelog: https://github.com/vinothsparrow/iframe-broker/releases
Contributors @ Github: https://github.com/vinothsparrow/iframe-broker/graphs/contributors
Add-on safety
Risk impact
Iframe Broker requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Iframe Broker has earned a fairly good reputation and likely can be trusted.