I'm migrating a some long-running javascript code from IE11 to firefox, but I've noticed when a firefox window is minimised the process grinds to a near stand-still.

Initial research suggests it is something that firefox does when the option config.trim_on_minimise is turned on. But that no longer exists on the latest version of firefox because it reportedly had no effect.

Is anyone else aware of this behaviour on Firefox, and do you know if there is a setting for it?


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