I'll look into this and see what @doug thinks. You are right. The threads that I tested were not ones that I participated in so I didn't realize it was doing that. Adding a 'go to first unread' button into mobile is just a matter of figuring out where to put it. Changing the stock behavior, as per your other suggestion, of course is more complicated.I suggest adding a "go to last unread" selection like the desktop version, or quite honestly, moving both mobile and desktop to always navigate to the newest post. I mean, who ever wants to start over?