Bug 468860 - class=plain should turn off -moz-appearance too, r=Neil

toolkit/themes/gnomestripe/global/global.css

@@ -235,6 +235,7 @@ separator.groove[orient="vertical"] {
 }
     
 .plain {
+  -moz-appearance: none;
   margin: 0 !important;
   border: none;
   padding: 0;

toolkit/themes/pinstripe/global/global.css

@@ -208,6 +208,7 @@ separator.groove[orient="vertical"] {
 }
     
 .plain {
+  -moz-appearance: none;
   margin: 0 !important;
   border: none;
   padding: 0;

toolkit/themes/winstripe/global/global.css

@@ -236,6 +236,7 @@ separator.groove[orient="vertical"] {
 }
     
 .plain {
+  -moz-appearance: none;
   margin: 0 !important;
   border: none;
   padding: 0;