Were you using -moz-box-shadow? Surprise! You now need to drop the -moz prefix and use just box-shadow as described in this page: box-shadow - MDN. Actually, if you want the shadow in Firefox 3.5-3.6, you need both properties. Sigh.

By the way, there are articles like the following for each release that provide updates on stuff like this so you can read ahead about surprises to come:

https://developer.mozilla.org/en/Firefox_13_for_developers

https://developer.mozilla.org/en/Firefox_14_for_developers

https://developer.mozilla.org/en/Firefox_15_for_developers

Thanks. This helped. One more query...... will this work even in ff3.5 and other versions if i don't put -moz ?

Firefox 4 and higher support box-shadow

Firefox 3.5 and 3.6 supported -moz-box-shadow

Firefox 3.0 and earlier did not support either

Thanks once again