Yeah, 0.0 delay sets it to default in firefox.
(
Mu Dinofiddler,
Sat 12 May 2012, 15:33,
archived)
on one of my phones a delay of 0 runs at full speed though
so it's not a consistent thing that can be relied upon it seems
(
discomeats This canoe,
Sat 12 May 2012, 15:34,
archived)