CSS3 multiple box-shadow transition in Firefox not working - css

Question

This transition works in Safari & Chrome (= Webkit browsers), but not in Firefox (= Mozilla). Why?
a.lorem {
width: 100px;
padding: 20px;
display: block;
color: white;
text-align: center;
background: rgb(191,210,85);
background: -moz-linear-gradient(top, rgb(191,210,85) 0%, rgb(142,185,42) 50%, rgb(114,170,0) 51%, rgb(158,203,45) 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgb(191,210,85)), color-stop(50%,rgb(142,185,42)), color-stop(51%,rgb(114,170,0)), color-stop(100%,rgb(158,203,45)));
background: -webkit-linear-gradient(top, rgb(191,210,85) 0%,rgb(142,185,42) 50%,rgb(114,170,0) 51%,rgb(158,203,45) 100%);
background: -o-linear-gradient(top, rgb(191,210,85) 0%,rgb(142,185,42) 50%,rgb(114,170,0) 51%,rgb(158,203,45) 100%);
background: -ms-linear-gradient(top, rgb(191,210,85) 0%,rgb(142,185,42) 50%,rgb(114,170,0) 51%,rgb(158,203,45) 100%);
background: linear-gradient(to bottom, rgb(191,210,85) 0%,rgb(142,185,42) 50%,rgb(114,170,0) 51%,rgb(158,203,45) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#bfd255', endColorstr='#9ecb2d',GradientType=0 );
box-shadow: inset 0 -3px 0 #A9A9A9,
0 3px 0 #EFEFED;
-webkit-transition: box-shadow .5s linear;
-moz-transition: box-shadow .5s linear;
-o-transition: box-shadow .5s linear;
-ms-transition: box-shadow .5s linear;
transition: box-shadow .5s linear;
}
a:hover.lorem {
box-shadow: 0 3px 0 rgba(0, 0, 0, .1),
inset 0 -3px 0 rgba(0, 0, 0, .1),
inset 0 0 100px rgba(255, 255,255 , .3);
}
Fiddle
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Answer 1

first, you need to write a.lorem:hover and not a:hover.lorem
after, border-shadow multi values need to be corresponding to their ":hover" pair.
"inset" border-shadow can't transit to "outset" border-shadow.
exemple :
a.lorem{
box-shadow:
inset 0 -3px 0 #A9A9A9,
0 3px 0 #EFEFED,
inset 0 0 0 rgba(0,0,0,0); /* for third ":hover" value */
transition:box-shadow .5s linear; /* add prefixed verison (-moz-, -webkit-, ...*/
}
a.lorem:hover{
box-shadow:
inset 0 -3px 0 rgba(0, 0, 0, .1),
0 3px 0 rgba(0, 0, 0, .1),
inset 0 0 100px rgba(255, 255,255 , .3);
}