-moz-box-shadow: 0 0 20px #000;
specifically designed for FireFox browsers.
If you want to apply a similar shadow effect in other browsers, you can use box-shadow: 0 0 20px #000;
For Internet Explorer versions below 9, additional adjustments are required. Consider using the following code snippet
filter:progid:DXImageTransform.Microsoft.Blur(PixelRadius=2,MakeShadow=true,ShadowOpacity=0.20);
-ms-filter:"progid:DXImageTransform.Microsoft.Blur(PixelRadius=2,MakeShadow=true,ShadowOpacity=0.20)";
zoom: 1;
You may need to experiment with the values to achieve the desired result.
Incorporating all these changes, your CSS style could look like this:
.something{
-moz-box-shadow: 0 0 20px #000;
-webkit-box-shadow: 0 0 20px #000;
box-shadow: 0 0 20px #000;
filter:progid:DXImageTransform.Microsoft.Blur(PixelRadius=2,MakeShadow=true,ShadowOpacity=0.20);
-ms-filter:"progid:DXImageTransform.Microsoft.Blur(PixelRadius=2,MakeShadow=true,ShadowOpacity=0.20)"; zoom: 1;
}