-moz-repeating-linear-gradient

The CSS   Mozilla extension property works similarly to the standard linear gradients as described by, but it automatically repeats the color stops infinitely in both directions, with their positions shifted by multiples of the difference between the last color stop's position and the first one's position.

Mozilla currently only supports CSS gradients as values of the  property, as well as within the shorthand. You specify a gradient value instead of an image URL.

Values
CSS example:

That will produce: