[FIXED JENKINS-19896] removing unprocessed -moz prefixed css

These currently show up as errors in the Firefox console. While they're not hurting anything, I'd like to help a little bit by getting rid of the unused `-moz` prefix declarations. Specifically: `-moz-box-shadow`, `-moz-border-radius`, `-moz-opacity`, and `-moz-text-overflow`.

unprefixed `box-shadow` has been supported since firefox 4.
see: https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow

unprefixed `border-radius` has been supported since firefox 4.
see: https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius

unprefixed `text-overflow` has been supported since firefox 7.
see: https://developer.mozilla.org/en-US/docs/Web/CSS/text-overflow

unprefixed `opacity` has been supported since firefox 1.
see: https://developer.mozilla.org/en-US/docs/Web/CSS/opacity