1632270 - unhandledrejection doesn't work correctly in content scripts

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P3)

Description

[miika9764]

Attachment: files.zip

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0

Steps to reproduce:

• Installed the extension in the ext directory at https://github.com/siikamiika/firefox-unhandledrejection-addon-bug
• Opened index.html in the page directory
• Clicked the "Trigger unhandledrejection" and "Trigger unhandledrejection from extension" buttons

Actual results:

Got the alert
"Caught unhandledrejection in extension: ReferenceError: somethingStupid is not defined"
and the text
"Received unhandledrejection: ReferenceError: somethingStupid is not defined"
to the page when clicking "Trigger unhandledrejection", but nothing from the "Trigger unhandledrejection from extension" button.

Expected results:

I shouldn't have gotten an alert from the first button, and the second button should have alerted "Caught unhandledrejection in extension: unhandledrejection from extension". For example Chrome behaves this way.

Comment 1

[Yoonchae Lee]

The same bug exists for the "error" event listener as well.

Tested on Firefox 134.0 (aarch64)