this menu is available under Linux also. It's a standard eZ publish JS popup menu. Verify that the extension is enabled. Also try to clear the cache after the extension is enabled.
A follow up solution: My fault, the menu did work correctly yet also on my OpenSuse 10 desktop. The especially thing was that I had to left click once with the mouse pointing directly on the folder icon, and then the popup menu pop apperar. If I click on the folder name instead, it doesn't work.
That is the "standard" behavior. Left click on the icon to get the context menu, left click on the node name to view the node.
Thinking of it, it might make sense to display the context menu on right clicking on the link as well? Or is that evil because it'd override the browser context menu?