I use Firefox 117.0.1 on MacOS at the moment. After recent update, I was able to see this built-in translate feature in url tab. It can now translate pages offline and more or less okay quality for me.
I use the same version of Firefox on Windows. But this feature is not available and I cannot see it in settings either. My question is, I know this is beta but is this MacOS only for now or I somehow enabled this feature on MacOS?
No. It should be available on all platforms. I think they’re just rolling it out progressively to get feedback and test it for bugs.