I have pinned several web links to my Android homescreen. However, if I load these links twice, each one opens in a new tab inside Firefox Beta meaning that I have two tabs with the same content. If Firefox were able to detect that the link is already open in one of the tabs and just open that tab instead it would stop the user from opening several tabs. It would be one small step closer to having a weblink behave like a web app. This logic already exists in Firefox desktop when you search in the Awesome bar, it will redirect you to an existing open tab.
We also have a switch-to-tab implementation in Fennec, so maybe we should just take that switch-to-tab code path when you open a homescreen shortcut. That sounds reasonable to me (and I agree, I also have a shortcut I use all the time and this is annoying).
This might be a good first step. Next steps might be to implement Web Manifest  and App Scope  on Android! :) 1. https://bugzilla.mozilla.org/show_bug.cgi?id=1003890 2. https://bugzilla.mozilla.org/show_bug.cgi?id=1038833
Dupe of bug 937253, which is fixed