Make gulp.js open non-default browser
<p>The title pretty much says it all. I'm on Windows 10, and I have a node app that I start with <code>npm start</code>. (I know almost nothing about node.js.) The app runs on gulp.js. I need the app to open in Firefox, even though Chrome is my default browser. How can I do this? Here's the code that opens the app now; the docs don't allude to there being such an option for the <code>open</code> parameter:</p>

<p><code>gulp.task('webserver', function() {
  gulp.src('./app')
    .pipe(webserver({
      livereload: true,
      open: true,
      defaultFile: 'index.html',
      port: serverPort
    }));
});</code></p>