(Speaking of Bing, I've switched from Google Maps to Bing Maps. It's much faster because it's prerendered like Google Maps used to be. Also, in the not-so-coincidental category, Google's new Inbox service doesn't work on Firefox.)
This change is going down in December, probably for Fx35, but it's not clear if this will land on the 31ESR branch. That said, I have no good reason not to honour the change whether it lands on 31 or (from our perspective) 38; I don't get paid by either one of them and they don't care whether we use one or the other, so I've got no dog in this fight. If you don't like this, set your default appropriately. As always, if you want to donate, the best way is to click on the ads on this very blog and let Google pay me on your behalf.