1391188 - WebExtensions content script created iframe response message use Promise, will invalid

Status: UNCONFIRMED

(WebExtensions :: General, defect, P5)

Description

[pea3nut]

Attachment: a webextensions demo

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Build ID: 20170802111520

Steps to reproduce:

I use content script created a iframe and insert to page in my webextensions, then, The background script use broswer.tab.sendmessage send message, iframe script response it. I find it's no works when iframe listener return a promise, but ,if listener called the sendResponse function, it will works.
you can install file description webextensions, click the broswerAction button, it will insert a iframe in page. clink the iframe inner button ,check console ,you will easy to understand what i say


Actual results:

content script created iframe and insert to page, iframe script broswer.message.onMessage listener return a promise will be invalid.



Expected results:

expected it can same as content script

Comment 1

[Andy McKay]

For what its worth, I simplified your script down and found that basically sending sendMessage with Promise based replies between a content script and background script seems to work just fine, that was my main concern. Zombie might know more.

Comment 2

[Kris Maglione [:kmag]]

This happens because of the way we handle content script API bindings in unprivileged extension frames. We create the bindings in a Sandbox rather than in the window global, but when we check whether a return value is a promise, we test against the Promise constructor in the sandbox.

Comment 3

[Andy McKay]

Thanks Kris. Would you call this by design then, and we should close?

Comment 4

[Kris Maglione [:kmag]]

No, it's definitely a bug.

Comment 5

[Firefox Bug Husbandry Bot]

Bulk move of bugs per https://bugzilla.mozilla.org/show_bug.cgi?id=1483958