Thanks for your answer. That's correct as much as I can see in the EKS docs. But in GKE there is a little disclaimer here
If you want to use a beta Kubernetes feature in GKE, assume that the feature is enabled. Test the feature on your specific GKE control plane version. In some cases, GKE might disable a beta feature in a specific control plane version.
They basically say "ok, trust on all the beta features would be enabled by default, but we can disable some of them without advising you". Funny guys.
I’m using Librewolf (a Firefox fork) and have the same issue.
Just check Firefox messaging folder exists in your home
ls -l ~/.mozilla/native-messaging-hosts
In my case, I needed to create a symlink to make it work with my browser
ln -s ~/.mozilla/native-messaging-hosts ~/.librewolf/native-messaging-hosts
Maybe you could apply a similar workaround. Hope this helps