Use github to set up priority
We have tons of issues open on github. They are sorted with labels which describe what the issue is about (UI, federation, browser specific, etc).
BUT we have no way to sort issues according to their importance. Some issue are open because we think it could be nice to work on that point (for example, improve the atom feed) but they are absolutely not an emergency. At the opposite, youtube embedding is broken in Firefox, this affects thousands of users everyday, and it's open for months without any activity.
I think we should clean the labels, removing the ones we do not use anymore, and adding some new defining three levels: "Urgent" (or ASAP), "Needed" and "could be nice to have" (I need native speakers to fine better words here, but I think you got the idea.