[Trezoid]

using:

color: transparent; text-shadow: 0 0 5px;

Works way better for text on non-webkit browsers and is supported by everything but IE (and even that supports it in 10)

The current form of the blur on firefox is just plain ugly, and seems to be an overly complicated way of achieving the effect.

[DougWebb]

Just tried this out; on Firefox at least you have to specify the shadow color, otherwise it inherits from the text color and becomes transparent. So, text-shadow: 0 0 5px #000