https://github.com/sjord/messpostage

PostMessage extension
https://github.com/sjord/messpostage

browser-extension postmessage

Last synced: about 1 month ago
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PostMessage extension

• Host: GitHub
• URL: https://github.com/sjord/messpostage
• Owner: Sjord
• License: mit
• Created: 2018-02-15T09:12:15.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2019-08-28T11:40:46.000Z (almost 6 years ago)
• Last Synced: 2025-04-18T21:31:05.602Z (about 2 months ago)
• Topics: browser-extension, postmessage
• Language: JavaScript
• Homepage:
• Size: 82 KB
• Stars: 96
• Watchers: 5
• Forks: 18
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
## MessPostage

Notifies you if a site uses the [postMessage API](https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage). You can install this extension from [its Firefox Add-On page](https://addons.mozilla.org/en-US/firefox/addon/messpostage/).

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: