Can't restore firefox settings with .mozilla backup

Here’s what I have

One folder is a bit different (“default-release”, not “default-default”) but basically I suppose they’re the same. Still, when I copied these to a USB stick and then to another machine, they don’t work. Weird.

I fiddle with my computers quite a bit and I’m not an expert, so I could have changed a lot of things to make things go wrong, I suppose. But shouldn’t this work?