Hangs FF 14.0.1 Rated 1 out of 5 stars

At least through Linux Mint 13 Cinnamon. If another browser window is opened, this add-on setup wizard comes again and ask me the same questions with void values and some "FIXME" string scattered all over the frame.

It makes the browser impossible to close properly; and when I open again, it starts again.

I wasn't able to make use of it. A pity.