Hi,
I've just updated firefox and fast dial to the last versions : ff37.0.1 and fd 4.12.

I've just noticed that if I pin a tab with fast dial opened inside, when I click to open o link from fast dial, it opens in a new tab, not in the same one as it did with all the previous FF versions.
And no matter which option is selected in the tools.
Another thing is when I have a normal tab pinned with google opened, I can't open fast dial in it; fast dail will open in a new tab.

But if I release the pinned tab, Fast Dial behaves normally.