Originally Posted by samuellawrence
I have to create a new desktop session or environment and run only browser in that.
Help you with what?? You're going to have to actually provide some details, like what EXACTLY you're trying to do, version/distro of Linux, environment, etc. As it is, your questions makes very little sense.
To give you a quick answer right now, click on another desktop on your Gnome or KDE panel, and run your browser.