Webpage-to-extension messaging

Safari 15.4 Release Notes shows that webpage-to-extension messaging using externally_connectable is supported. https://developer.apple.com/documentation/safari-release-notes/safari-15_4-release-notes

However, when I tried testing it, I was not really able to get it to work. What I have tried:

  • Added matches array to the externally_connectable object in manifest.json
  • Obtain the extensionID using browser.runtime.id
  • Added listener to onMessageExternal for extension
  • Send a message from a webpage, that is in the matches array, using chrome.runtime.sendMessage with the extensionID obtained above

With these steps, I wasn't able to receive a message sending to the extension. I am not sure if the extensionID is wrong or if I am missing any crucial steps. Can someone please recommend what I should try?

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SafariLearner
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It's hard to say exactly what the issue is without a sample project/website.

Could you file a bug report on https://feedbackassistant.apple.com with a sample extension (and a website that it is meant to work with), and we could help determine exactly what is going on?

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bweinstein
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