How to make Firefox store cache in RAM?

I have two devices:

First (china no-name home server). Yes it supports drives. But i am too lasy to disassemble it (it is hell!). I already disabled disk cache in about:config, but it didn’t speed up the system much. The system is on a memory card. But RAM is 64 gigs. Is there any way to put all the cache (including offline data) into RAM? I don’t care if I have to restart because the slowdowns are annoying.

And second. My main laptop. 16 gb ram. Here is why I wanna save SSD life.

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