Quote - bobvan, I was wondering the same thing.  I just did a render and let it go for 24 hours and some of the orange pixels just never went away.  I notice it the most when I use blonde hair.  I have plenty of light on the subject, none of the glossiness is too high, all of the color settings are below 255, I just don't know why they appear or why they refuse to totally disappear. 

What were/are your specular settings? They often affect firefly production just as much as your glossy settings.

By way of the lux forum some time ago, it was suggested to stay below 84, which as a nice side effect, also renders faster.

Personally, I like mine around 55 or lower, surface dependant.

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