Samsung smart tv browser in fullscreen mode

Here is how to do it on the TV Samsung UE32H4510 :

• In the browser click in the upper right corner on the gear icon
• Go to "Browser Settings"
• Go to the "General" sub-menu
• And then you have an option called "Hide menu" ("Masquer menu" in French) that you need to enable
• Finally you need to restart the browser application to have the menu hidden

No you can't. I have requested this feature from Samsung, but they have not answered me. Top navigation will be always visible in Samsung TV's.