All Projects → Sjord → messpostage

Sjord / messpostage

Licence: MIT license
PostMessage extension

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javascript
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MessPostage

Notifies you if a site uses the postMessage API. You can install this extension from its Firefox Add-On page.

This extension puts a little envelope in your toolbar. As soon as the site you are visiting adds a message event listener or posts a message, it becomes red:

Clicking this button will shows which messages were sent and where event listeners have been added:

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