Unknown property '-moz-box-shadow'. Declaration dropped

In file .css You just Find and replay moz to webkit

Example

-moz-box-shadow  **to** -webkit-box-shadow

-moz-border-radius **to** -webkit-border-radius

-moz-border-top-left-radius **to** -webkit-border-top-left-radius

box-shadow does not require any prefixes since more than an year ago (firefox 4 and chrome 10): https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow

Since Firefox supports box-shadow so well, it has no reason to keep -moz-box-shadow around. It dropped support for the prefix in version 13, so if you're really that concerned about a warning and don't mind losing support for older versions of Firefox, you can remove that declaration. Likewise for -webkit-box-shadow for recent versions of WebKit browsers.