code: function(browser, data) {
          exec(data[browser][process.platform] + " -CreateProfile bunyip-"+browser,function(){
              data[browser].process = exec(browsers[browser][process.platform] + " -no-remote -silent -p bunyip-"+browser + " " + url);
          });
      }
docs: Specify it to be a new process and to create/use a custom profile