This would be VERY cool. If you added a checkbox to the "add web application" view, that made it so your user-agent would appear as a mobile device. That way you'd be able to add https://m.imgur.com and the new https://m.reddit.com.
Right now, this is not possible. You can only do it if you use Chrome and change your device view to a mobile device. So it tricks the site and enables a cookie that lets you view the mobile site.
Customer support service by UserEcho