Hello, after Chrome added their new feature push notyfications from facebook are poping up in my work computer, that suck. So here is solution how to disable any notyfications form chrome not only facebook.

1.First go to Chrome settings page: chrome://settings/

2.Then use button: Show advanced settings on the bottom of site

3. Go to Privacy section 

4. Press button: Content Settings - popup window should apear

5. On the popup window go to section "Notyfications" and select option: Do not allow any site to show notifications

DONE :D