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I've never seen Firefox unload an inactive tab without my permission, but it looks like according to the docs it's had a 'memory is low, unload tabs' mechanism since 2019. It looks like that behavior was further adjusted in this release, though it's not clear to me what the difference is.

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>though it's not clear to me what the difference is

This one works well enough that we can default it on :-)

The previous one didn't reliably detect low memory situations and you could crash with OOM before it ever triggered. The article goes into detail about the various signals that have to be monitored on Windows. We had to do some work on gathering the metrics and correlating with crash data to determine when to trigger.

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