According to the release notes for FF 147 it is now supported, also caniuse and mdn says so.
but in my firefox browser (147.0.2) when i inspect an element in the dev tools which is using the new css properties i see a warning saying that it is NOT supported in FF 147. I also struggle to get it working, and when i open the same page (with a hello world kind of example) chromium and FF get different results