before unload, prompt user if they really want to close?

[Nathan Pierce]

I've tried many versions of triggering a confirmation to the user if they close the extension window and none seem to work. Is beforeunload still allowed, or has it been disabled to prevent abuse?

[Nathan Pierce]

Per https://chromestatus.com/feature/5082396709879808,

> The beforeunload dialog will only be shown if the frame attempting to display it has received a user gesture or user interaction (or if any embedded frame has received such a gesture). (There will be no change to the dispatch of the beforeunload event, just a change to whether the dialog is shown.)

[hrg...@gmail.com]

This works for me:

window.addEventListener('beforeunload', evt =>{ evt.returnValue = true })

[Nathan Pierce]

Yep, that's what I have. I found the answer: I wasn't interacting with the extension before trying to close it, so the beforeunload never triggered.