SERVICES.getService(IShellService.class).shellOpen("http://www.eclipse.org/");

public class WebStandaloneRwtEnvironment extends AbstractStandaloneRwtEnvironment {

  public WebStandaloneRwtEnvironment() {
    super(Activator.getDefault().getBundle(), ClientSession.class);
  }

  protected BrowserWindowHandler createBrowserWindowHandler() {
    return new TabbedBrowserWindowHandler();
  }
}

@SuppressWarnings("restriction")
public class TabbedBrowserWindowHandler extends BrowserWindowHandler {
  private static IScoutLogger LOG = ScoutLogManager.getLogger(TabbedBrowserWindowHandler.class);

  @Override
  public void openLink(String link) {
    if (link == null) {
      return;
    }
    if (isHttpLink(link)) {
      openLinkInNewBrowserTab(link);
    }
    else {
      super.openLink(link);
    }
  }

  public void openLinkInNewBrowserTab(String link) {
    if (!isHttpLink(link)) {
      return;
    }

    // Code from http://www.eclipse.org/forums/index.php/mv/msg/38108/999310/#msg_999310
    JSExecutor.executeJS("window.open('" + link + "');");
  }
}