Worked fine for me on FF 39.0. Edit to add: with the caveat that it is going back through the maps, per meritt's comment (https://news.ycombinator.com/item?id=

Worked fine for me on FF 39.0. Edit to add: with the caveat that it is going back through the maps, per meritt's comment (https://news.ycombinator.com/item?id=9839060 https://news.ycombinator.com/item?id=9839060). I don't find the map history problematic.