Hello guys, how can i config Ubuntu (on a VPS) to use Hitleap Otohits and FireFox? (at least) I need to install a GUI and etc right?

I want Ubuntu because i think Windows server use a lot of ram :/ What do you guys think? Whats your opinion about:

Ubuntu Vs Windows Server

And if you can tell me how to config to use what i said befor it would be nice

ps: can i use portable FireFox on Ubuntu? :/ (i can't right? Because its .exe ... )

Thanks!