Why does runtime.onSuspend not execute window.localStorage.setItem?

Add-ons Development
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1

I am coding my first extension right now and I wanted to save a value before the browser closes. I, at first, tried to use browser.runtime.onSuspend.addListener() :

browser.runtime.onSuspend.addListener(() => {
	window.localStorage.setItem("suspent", Date.now());
});

This did not work. I googled for a bit found that one could also use window.addEventListener(‘unload’, function):

window.addEventListener('unload', function () {
	window.localStorage.setItem("unload", Date.now());
	});

This version worked without any issues.

Does anybody know why the first one using onSuspend didn’t work?

2

Which Firefox version are you using, and how do you load the extension in Firefox?

3

Nevermind. I hadn’t read the documentation for onSuspend properly. It only triggers when the to be unloaded script is a non-persistent background page. I was using a persistent one.

But still thank you for trying to help.

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