Be careful! Rated 5 out of 5 stars
It seems something strange is happening in Fx community....
I really don't understand why some users keep on telling lie to misguide others to use Fast Dial 2.16 rather than Speed Dial.
Either Fast Dial 2.15 or 2.16 is a malware-like addon, don't try it.
And Speed Dial is free of spam up to this point, so it may be a better choice for you.