How to manually suspend Firefox extension's background script?

[barbaz]

For converting Firefox extension from Manifest V2 to Manifest V3, the background script needs to be adapted to be non-persistent. Which means it's necessary to test that the background script behaves correctly when it gets suspended and then reloaded in a variety of states.

Such testing would be greatly facilitated by manually requesting immediate suspend of the background script.

How to do this in Firefox?

The reason to only "request" suspend is because of this:

Note: If something prevents the event page from being unloaded, the runtime.onSuspendCanceled event will be sent and the page won't be unloaded.

... so testing this properly requires not forcing suspend in situations where an automatic suspend attempt would have been cancelled.

Thanks for any ideas.