In Superfly every surface is reflective. In Firefly, Specular is used to provide fake reflections (shininess) because FF is so slow at rendering reflections, especially blurred/soft ones. SF is way faster, so it does raytraced reflections on everything all the time. SF interprets any specular node as reflection. This is why SF requires an environment to enclose the scene.

If glass is rendering too dark, check the maximum bounces setting on the right hand side of the render settings dialog - the default is 3 which is too low. Also, I prefer using GGX for any of the nodes which have the Distribution option - I think the falloff from the highlights looks far better.

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