Comment 2 for bug 909423

Are we going to do something else with this? Released versions have prefix %s working as you described, and the only other idea mentioned is "use the current URI". In my opinion that would be best done with a different %-specifier, e.g. %u for "current page URI", which would be valid at the start like %s. But that seems outside the scope of this bug in particular, and of dubious utility.