I just came from Ubuntu, where all (or almost all) applications use the global menu to show the menubar of each application. However, here in elementary OS I'm having problems with all non-elementary applications.
Here are a couple of examples:
Atom text editor
Sublime text editor
As you can see, the menubar is displayed as a grayish bar wasting pixels in all those applications. My question is: Is there a way to hide the menu bar? Some applications (like Firefox) toggle the menu bar using the alt key. However, this does not work in every case.