Bug 246620 – Messages send from iFrame not received by extension popup

• Component: WebKit Extensions
• Status: NEW

[Carlos J.]

Try to send a message from an iframe running a contentscript to the extension page containing the iFrame. 

Sample extension:
https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/issues/safari-9637664-messaging-api-from-content-script-frame

If it works (like in Google Chrome), the text of the extension page should change to "success".

[Carlos J.]

See also:
https://feedbackassistant.apple.com/feedback/9637664
https://developer.apple.com/forums/thread/690249

[Alexey Proskuryakov]

rdar://83280648

[Carlos J.]

Just tested in Safari Technology Preview 192, and the issue persists.

[Carlos J.]

In Safari 18.1.1, calls to chrome.runtime.sendMessage from within a contentScript of an iframe in an extension popup throws the
"Error: Invalid call to runtime.sendMessage(). Tab not found."

Same behaviour can be found in Safari Tech Preview 209.

[Carlos J.]

This can be reproduced in Safari 18.4. The top extension frame does not get the messages. However the background page can listen to the messages.

See:
https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/demos/messaging-sub-frame-cs-to-extension-top-frame

In general it seems Safari completely skips same-tab messaging, as can be demonstrated with:
https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/demos/messaging-extension-cross-frame-messaging-with-responses

[Carlos J.]

However, calling runtime.sendMessage from within a contentScript of an iframe in an extension popup throws the
"Error: Invalid call to runtime.sendMessage(). Tab not found." and no message is sent at all, not even to the background page. This seems like a separate issue from the same-tab messaging issue.

This has been tested in Safari 18.4 with this demo extension:
https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/demos/messaging-broadcast-from-sub-frame-cs-in-extension-popup